I'm a gamer so I love games, in order to play them it helps to have as many consoles as possible though for the different games and experiences I can have with that, so that's how it works for me. I have like 4 consoles + PC to game on right now and that's pretty good for me, heck I have more gaming I can do on my iPad or iPhone as well 
fanboys just seem odd to me, you're a gamer, enjoy gaming, don't worry about PS this or XBOX that or Nintendo this or PC that y'know, just game and enjoy it, whatever platform(s) you got's 
a system seller I guess is any big name game that get's a lot of attention but is single platform or at least timed exclusively or has exclusive content/features, so something like Gran Turismo is a big system seller for Sony as it's PS3 only and has brand recongition, Halo does that for the XBOX 360 and for Nintendo most of their games have the brand recognition as well,.
