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Gamble wheels sit between a full buy and a normal spin, letting you pay a fraction of the feature price for a chance at winning the bonus or losing the stake outright. The odds on the wheel are usually set so the expected cost matches the direct purchase almost exactly. I checked this against the numbers posted on https://thebonusbuyslots.com for a few Pragmatic and Booming games, and the difference was under one percent in every case. So the wheel is just variance dressed up as a discount.
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