Steam also lets you sell steam keys on your own site, and they don't take a cut of that. There is a bit of an issue with selling your own Steam keys and sellin

Steam also lets you sell steam keys on your own site, and they don't take a cut of that. There is a bit of an issue with selling your own Steam keys and selling on multiple platforms though. The more people who purchase your game on Steam, the higher Steam's algorithm will rank the game, so there's something to be said for not spreading out sales.