A number of studios pair the purchase option with a secondary gamble step. After paying the standard price, the player may spin a wheel that either upgrades the round to a higher tier or cancels it altogether, creating a second layer of risk before the feature even begins. In bonus purchase slots that use this structure, the expected value of the gamble is typically neutral, so it changes variance rather than average return. Players who prefer predictability can usually skip the wheel and accept the base version.