Resident Evil 5 (PS3)
Capcom even had the right idea with Resident Evil 5's single player/Co Op DLC (not including versus, which is actually an online pass itself when you think about it). In this way developers would be working with the consumer to turn a profit by offering more content to an already complete game, which in the end will profit much better than working against each other. I mean think about it, the more rules developers try to force on people, the more those people will try to work around them. Personally I can see pirated copies of games with the locked single player content included on the horizon if they aren’t careful.