Simple, I have an Xbox 360 and I don't have a PS3. The other answer is that newer titles are now for multiple platforms and not exclusive to Sony so I see no reason why I would buy a PS3 just to play Sony titles when I can play it on the one I already own. I think it's silly to be sworn to one console because you're essentially inhibiting yourself as some consoles will offer things others cannot such as Dead Rising 3 ;___;

I am now at a crossroads because I was sure I wanted the PS4, but I also want Dead Rising 3. It's not really worth the purchase for one game though, so I'll just wait it out and see what else is to offer before making a next gen purchase.