Plague Inc. allows you to unlock the game for a few bucks as an IAP, but it's a one-off purchase. That seems to work for copy protection.
Needling the shit out of your customers like Dungeon Keeper is doing is killing the system. Unless a game ends up on the Humble Bundle, I almost refuse to get it because I'm worried about IAPs.
some games that end up on the humble bundle have in app purchases. I don't know if they've changed their policy about it. I remember one game in particular that was pretty aggressive with it's DLC nag.
Needling the shit out of your customers like Dungeon Keeper is doing is killing the system. Unless a game ends up on the Humble Bundle, I almost refuse to get it because I'm worried about IAPs.