I have never once based a purchase solely on if the game is an exclusive or not. If a game is good, then it's good. I could care less if it's on 5 consoles as long as I have fun with it. Games are for fun after all, so if you have fun then they're working. Gamers make their own politics too much.

And like Agent Proto said, it could always boost sales. More sales means more money being put into games in the future, and that's always good.