I personally will buy a PS3 eventually, mostly for the BLu Ray player. I also game so I'll get a few games for it but nowhere near the amount of games I'll buy for my PC or my Wii
The only Games I will definately buy for PS3 are:
GTA4, MGS4, Little Big Planet (maybe)
That's it. I hope Sony makes a bunch of money on Blu Ray Discs cause that's all they're going to sell a ton of