ZFR: Anti-sale: for a limited time only games up to 30% more expensive. Also for $10 buy a lucky sock that's guaranteed to contain a random game of value $7.99 or less.
Actually, itch.io has reverse sales, which are as you describe, but for individual games. (This feature was introduced as an April Fools joke, but is apparently a permanent feature of the site.)
https://itch.io/updates/introducing-reverse-sales dtgreene: [...]
See, we have enough games for at least a minor sale. Also, why doesn't your list include Tyrian 2000?
bhrigu: I sadly admit that I have not yet played it.
Well, maybe you should get it the next time it goes on sale! Or, if you can afford to put down $0 (or your local equivalent) on a game, why not buy the game at full price and not worry about waiting for the sale!