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The feature buy is the clearest example in modern slots of a mechanic that changes the bet rather than the game. It is also the one where the relevant numbers are published and almost never read.
What you are buying
A bonus buy exchanges a fixed price — commonly around 100× the current stake — for immediate entry into the feature round. What it removes is the base game: the spins between features, which cost little individually and which generate part of the game’s theoretical return.
That is why it is a different bet rather than a faster version of the same one. The distribution changes completely: one large, high-variance event instead of a long sequence of small ones.
The number most people never see
Studios publish a separate theoretical return for the buy feature, in the same information screen as the base-game figure. The two are usually close but not identical, and either can be the higher one depending on the title.
- Open the information or paytable screen.
- Find the line for the base game theoretical RTP.
- Find the separate line for the feature buy.
- Note both. If only one figure is published, that is worth knowing too.
Two numbers for the same game sit side by side in exactly one place. The buy button shows the price and not the return, which is the wrong half of the equation to display prominently.
Why the session ends so much faster
| At base stake | Buying the feature |
|---|---|
| One spin costs one unit | One action costs about a hundred units |
| A hundred spins is a normal warm-up | A hundred units is one purchase |
| The expected loss accumulates slowly | The same expected loss arrives in minutes |
| Variance is spread across many small events | Variance is concentrated in a few large ones |
Nothing in that table is a criticism of the mechanic. It is a description of what compressing the same expected loss into a fraction of the time feels like, which is usually the actual experience people describe when they say the buy “drains” a balance.
When it is a reasonable purchase
If the feature round is the part you actually enjoy, buying it directly is a legitimate way to spend an entertainment budget you had already decided on. That is a real reason and it does not need to be dressed up as strategy.
What does not hold is the version where buying is framed as a route to better odds. The expected value is set by the published return on the buy feature, and paying a fixed price for a high-variance event does not improve it. The general pattern — trading a longer wait for an immediate outcome — is the subject of delayed gratification, and slot design monetises it directly.
For what the rest of the mechanics change, see seven slot mechanics.
Frequently asked questions
Does a bonus buy have a different RTP?
Usually yes, published separately in the same information screen.
Is buying better than waiting?
Neither is better in expectation. Buying removes the base-game spins and concentrates variance.
Why do buy sessions end faster?
Each purchase costs about a hundred base spins, so the same expected loss arrives far sooner.
Is it ever sensible?
If the feature is what you enjoy and the price is budgeted, yes. Not as a way to improve odds.
Where are the numbers?
Price on the buy button, separate RTP in the game rules section.
