Well definitely blu-ray players was my first reason. And it shows increasingly more today, as I've only bought 6 games for the system and played... well none of them haha (although I've played a handful on my bro's PS3 in the 3 years leading up to my own PS3 purchase). The second reason I got it was for the exclusive games (mainly Last Guardian) but I've rarely had time for PS3 over my 360 or Wii so not one of the strongest reasons.
But I probably don't give my PS3 enough time and I let it get dusty. My fault, of course, but it's hard being a 3 console owner haha.