Lottery-style jackpot rollover displays that amplify the headline figure by a factor of three produce roughly an 8% increase in session-80 rebuys, while displays that amplify the same underlying number by a factor of ten suppress that behavior and in some cohorts reverse it. The finding, drawn from a 2024 field experiment across 41 sweepstakes-style and lottery-themed online products, suggests that the relationship between jackpot salience and continued play is not monotonic. Operators and regulators alike have treated "bigger number, bigger engagement" as an axiom; the rebuy data at the high-amplification end do not support it.
The Experimental Setup and Why Session-80 Matters
Session-80 refers to the 80th percentile of a player's session-length distribution within a product, measured in spins or draw entries rather than wall-clock time. It is a useful dependent variable because it sits past the point where novelty-driven play has decayed but before the attrition curve flattens into a product's habitual core. Rebuys at that threshold capture a deliberate decision: the player has already invested enough to have formed an expectation, and is choosing whether to fund another cycle. It is, in behavioral terms, a cleaner signal than first-deposit conversion, which is contaminated by acquisition-channel effects, or raw session length, which conflates engagement with idle time.
The experiment randomized 1.2 million authenticated accounts across three display conditions for the same underlying progressive jackpot. In the control, the jackpot was shown at face value. In the 3x condition, the display framed the figure as a "triple rollover" — the headline number multiplied by three, with the multiplier disclosed in a secondary line. In the 10x condition, the same mechanic was applied at a factor of ten. Disclosure was present in all conditions, which matters: this was not a deception study. It was a salience study.
What the 8% Actually Represents
The 8% figure is a relative lift in the probability of at least one rebuy at or beyond session-80, comparing the 3x condition to control, holding product, stake band, and account age constant. In absolute terms the baseline rebuy rate was 11.4%, rising to 12.3% under 3x. The 10x condition produced a rebuy rate of 10.6% — a 7% relative decline against control, and a 14% relative decline against the 3x arm. Both differences were significant at conventional thresholds after correction for multiple comparisons across the 41 products.
Why Ten Times Overshoots
The mechanism most consistent with the data is plausibility discounting. A jackpot displayed at ten times its actual value does not read as a windfall; it reads as a claim the player has learned to distrust. Regular players of lottery-format products develop a rough internal model of what a jackpot of a given size implies about odds, ticket volume, and the operator's margin. When the displayed figure departs from that model by an order of magnitude, the display stops functioning as an incentive and starts functioning as a credibility signal — a negative one.
The 3x condition, by contrast, sits inside the band where the inflated figure remains interpretable. A player can construct a story about why the number is larger: rollover accumulation, a promotional overlay, a pooled prize. The story does not need to be accurate to do its work; it needs to be available. At 10x, no such story is readily available, and the disclosure line — which is identical in both conditions — does more damage than it does at 3x, because it contradicts a claim the player was already inclined to reject.
There is a second, complementary explanation rooted in reference points. Session-80 players have typically seen the jackpot display many times. A 3x shift is large enough to be noticed against the remembered baseline but small enough to be assimilated. A 10x shift triggers what is effectively a re-anchoring failure: the player cannot map the new number onto prior experience, and the resulting uncertainty reduces, rather than increases, the expected value of continued play in the player's own subjective calculus. This is consistent with the broader literature on probability weighting, where extreme and implausible magnitudes tend to compress rather than expand perceived attractiveness.
The Disclosure Variable
One detail deserves emphasis for anyone reading this as a compliance question. The lift in the 3x arm was not driven by players who failed to notice the multiplier disclosure. A post-experiment survey of a 9,400-account subsample found that 71% of 3x-condition respondents correctly recalled that the headline figure was amplified, versus 78% in the 10x arm. Awareness was higher, not lower, where the effect was negative. The finding is therefore about how disclosed framing shapes behavior, not about whether disclosure works. That distinction matters for regulators who assume that disclosure and salience are substitutes; here they operated on different channels.
Operational Implications and the Limits of the Result
The obvious temptation is to read this as a recipe: set rollover displays at 3x and harvest the rebuy lift. That reading overreaches in at least three ways.
First, the experiment ran on lottery-format and sweepstakes-style products with progressive prize structures. Slots with fixed jackpots and sportsbook parlay boosters have different reference-point dynamics, and the 3x optimum should not be assumed to transfer. Second, the effect was measured over a 14-week window ending in March 2024; rollover displays are subject to habituation, and a 3x framing that lifts rebuys in week three may decay to nothing by week thirty. The study did not run long enough to answer that. Third, and most importantly for U.S. operators, the regulatory treatment of amplified jackpot displays is unsettled and varies by state. A framing that is legal and disclosed in one jurisdiction may run afoul of advertising rules in another, particularly where the amplification could be read as a representation of prize amount rather than a promotional overlay.
There is also a responsible-gambling dimension that the rebuy metric tends to obscure. An 8% lift in session-80 rebuys is, from a harm perspective, an 8% lift in the population of players who continue past the point where most would have stopped. The study did not measure loss-chasing behavior or self-exclusion uptake in the treatment arms, and the ethical status of the finding depends heavily on those unmeasured outcomes. A framing that increases deliberate continuation among recreational players is a different object than one that increases continuation among players already exhibiting distress, and the aggregate rebuy rate cannot distinguish them.
What the Data Cannot Settle
The most useful open question is not whether 3x beats 10x — the direction is clear enough within this sample — but where the optimum sits between them, and whether it moves. The experiment tested two points on a curve and inferred a shape. A follow-up with arms at 2x, 4x, and 6x, run over at least twelve months to capture habituation, would do more to establish a usable design rule than any amount of replication at the two endpoints. Until then, the prudent reading is narrow: extreme amplification is not a free lever, and the assumption that engagement scales monotonically with the displayed number is, at least for lottery-format products, empirically wrong. Whether that wrongness is a design constraint or an opportunity depends on questions the rebuy data were never built to answer.