If a sale ends I try to move it quickly back to being on sale, that shouldn't happen very often though.
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You have full control over the price, right? I mean, you can change the price of the game whenever you want? Just make it a $7.99 game, and when you reach the state that it's fully done, or at least far enough on its way to deserve a $19.99 price tag, change it back to that price. This way, there is no in-between when a sale ends.