Because there are very few interesting PS3 games that I can't already play on the 360. I have no interest in Blu-Ray so that's not a plus. To top it off, I don't like Sony anymore after some very shameful episodes of theirs.
The only thing I would buy a PS3 for would be to play with Cell programming on Linux (and then I would probably buy a few games). I'd only do that when it's cheaper though.
My Mario Kart Wii friend code: 2707-1866-0957







