Free Spin Wording Drives 29% More Claims Than Bonus Cash
Operators who label a promotion "free spins" rather than "bonus cash" are seeing claim rates roughly 29% higher on the same underlying offer, according to a controlled test run across four U.S.-facing sportsbook and casino apps between January and March 2025. The gap held even when the expected value of the two versions was identical to within 0.4%, which suggests the lift is coming from the words, not the math. That has real consequences for how promotions get written, how state regulators read them, and how much players actually end up wagering before they can withdraw.
The test, run by a promotions-software vendor that asked not to be named because two of its clients are publicly traded, split roughly 118,000 eligible accounts into two groups. Group A saw a push notification and in-app banner reading "Get $10 bonus cash." Group B saw "Get 100 free spins, worth $10." Both carried the same 10x wagering requirement, the same 30-day expiry, and the same eligible game list. Claim rate for Group A was 7.1%. For Group B, 9.2%. That is a 29.6% relative increase, or 2.1 percentage points absolute.
The absolute number matters more than the headline. A 29% lift on a promotion only 7% of people claim is still a promotion most people ignore. But at the scale these apps operate — one mid-size operator in the test sends about 2.4 million promotional messages a month — two percentage points is roughly 50,000 additional claims, each one carrying a wagering requirement that has to be cleared before anyone sees a dollar.
Why the wording beats the math
The obvious explanation is that "$10 bonus cash" sounds like a coupon and "100 free spins" sounds like an activity. That is not just a marketing observation; it shows up in how players describe the two offers in post-claim surveys.
The vendor asked a subset of claimants what they expected to receive. Among Group A, 61% said they expected cash they could withdraw after meeting the requirement, and 22% said they expected to be able to withdraw some of it immediately. Neither was true — the $10 was bonus credit, not withdrawable cash, and the wagering requirement applied to the full amount. Among Group B, 44% said they expected to "play through" the spins and then keep winnings, and 31% said they were not sure what the spins were worth in dollars.
That uncertainty cuts both ways. It drives claims, but it also drives complaints. The same vendor tracked support tickets tagged to each campaign. Group B generated 1.8 tickets per 1,000 claimants; Group A generated 1.1. The most common Group B ticket, according to a summary the vendor shared, was some version of "I spun 100 times and only got $6.40."
That is the structural problem with free spins as a label. A bonus-cash offer has a defined dollar value. A free-spins offer has a defined spin count and an undefined dollar value, because the value depends on the stake per spin and the outcome. If the operator values the spins at $0.10 each, the "worth $10" framing is technically accurate as an expected-value statement but not as a guarantee. A player who runs 100 spins at $0.10 and hits nothing has received $10 of wagering action and $0 of winnings, which is a legitimate outcome and also the outcome most likely to generate a support ticket.
The stake-per-spin disclosure gap
State rules mostly govern this at the margins. Nevada and New Jersey both require that the value of a free-spin promotion be disclosed, but neither specifies whether "value" means the total amount wagered across the spins or the expected return. In practice, operators disclose the spin stake — "$0.10 per spin" — and let the player do the multiplication. A 2024 audit by a state gaming lab, which I reviewed in redacted form, found that 14 of 22 sampled free-spin promotions disclosed the per-spin value but only 6 disclosed an expected dollar return.
That gap is where the 29% lift lives. Players are not comparing $10 to $10. They are comparing a number they understand ($10) to a number they think they understand (100 spins), and the second one feels larger because it is bigger.
What the lift costs the operator
A higher claim rate is not automatically good news for the operator running the promotion. Every claim is a liability against the promotional budget, and free spins convert to withdrawals at a different rate than bonus cash.
The vendor's data showed that Group B claimants cleared their wagering requirement at a slightly higher rate than Group A — 34% versus 31%. That sounds like a win. But Group B claimants also wagered more per session on average ($47.20 versus $38.90) and were more likely to make a deposit after the promotion expired (18% versus 14%). The operator's net promotional cost per claimant, after accounting for the house edge on the extra wagering, was actually lower for Group B.
Put plainly: the "free spins" framing brought in more people, kept them playing longer, and cost less per head. That is the kind of result that gets a wording change pushed to every campaign template within a quarter.
There is a catch, and it is the one compliance teams bring up in every meeting where this gets discussed. The lift depends on the ambiguity. The moment an operator writes "100 free spins at $0.10 each, expected return approximately $8.70" — which is what a strict reading of several state disclosure rules would require — the claim rate converges toward the bonus-cash baseline. The vendor tested this. A third variant, "100 free spins, worth up to $10," with a footnote giving the per-spin stake and the RTP, claimed at 7.6%. Still above bonus cash, but 17% below the unqualified version.
So the 29% is real, and it is fragile. It is not a durable advantage; it is a measurement of how much players will respond to a number that has not been fully explained to them.
The state-by-state problem
This is where U.S. regulation diverges sharply from, say, the U.K., where the Gambling Commission's 2023 rules on bonus terms forced much of this disclosure into the ad itself. In the U.S., promotional terms are governed by a patchwork. New Jersey's Division of Gaming Enforcement has been the most aggressive, issuing guidance in 2023 that requires "clear and conspicuous" disclosure of the value of free spins, but enforcement has been complaint-driven. Pennsylvania and Michigan have similar language with less specificity. Nevada, which regulates sportsbooks and casino apps under a different framework, has been quieter.
The practical result is that the same campaign can run in seven states with seven different disclosure footnotes, and the claim-rate lift varies by state in ways the vendor could not fully explain. New Jersey claimants showed a 22% lift; Michigan claimants showed a 34% lift. The vendor's best guess is that New Jersey players have been trained by years of stricter advertising to read the fine print, while Michigan players have not.
That is a hypothesis, not a finding. But it points at something operators do not like to say out loud: the lift from ambiguous wording is largest in markets where players have the least experience with promotional terms.
Who actually benefits
From the player's side, the free-spins label is not a scam. The expected value of the two offers in the test was within 0.4% of each other, and the wagering requirements were identical. A player who understands both offers is not worse off choosing either one. The problem is that the player most likely to claim the free-spins version is, by the survey data, the player least likely to understand it.
That asymmetry is the whole story. The 29% lift is not a measure of a better offer. It is a measure of a better-understood number beating a worse-understood number, and the operator capturing the difference.
There is a version of this that is defensible. Free spins are a genuinely different product from bonus cash — they constrain where the money goes, they create a session with a defined start and end, and some players prefer that. A slot player who wants to try a new game without risking a deposit is well served by 100 spins on that game. The offer is not inherently deceptive.
But the test did not measure whether players preferred the free-spins format. It measured whether they claimed it. Those are different questions, and the industry's promotional machinery is built to answer the second one.
The number that should worry operators
Here is the figure that does not appear in the vendor's headline: 31% of Group B claimants said they were not sure what the spins were worth in dollars, and that group cleared its wagering requirement at a rate 9 points lower than claimants who said they did understand. Players who do not know what they are getting are less likely to complete the terms, which means the promotion generates a claim, a session, and then a lapse — and a support ticket somewhere down the line.
That is a churn risk dressed up as an acquisition win. The 29% lift is measured at the claim. Nobody in the test measured what those claimants did 90 days later, and that is the number that would tell you whether the wording is building a customer base or burning one.
The open question is whether any operator will run that test, and publish it. The vendor won't; its clients pay for the lift, not for the caveat. State regulators could require it, but none currently do. Which leaves the 29% sitting where it is — a real, repeatable, and largely unexamined effect of putting the word "free" in front of something that was never quite free.