1. You seem like someone who just wants to draw praise on the PS3.
I'll answer anyway for the sake of it. Yes, GT is a big system seller. As a matter of fact, to date, no game has pushed consoles as GT has and is considered the biggest franchise ahead of FF, Mario and Pokemon series according to times/fortune.
I am a Gamer... I play games and not consoles. I have a PC and Console on which I game... I like games. End of Story!