At this point, I'm tempted to buy Sinking City off of Gamesplanet to support Frogwares directly; I enjoyed the Resident Evil games back in the day, and The Evil Within series. I haven't gotten around to playing the RE remakes yet; maybe I'll work Sinking City into the queue first.
I don't think I've used Gamesplanet at all, I'm assuming their cut is far less than Steam's infamous 30%. (Not to start an argument about Steamware support, etc.)
PS. Offtopic, Apparently there won't be an Evil Within 3 anytime soon, Tango Gameworks is making Ghostwire: Tokyo instead, which actually looks pretty interesting.