Final fantasy was just one of many games that made me buy my PS2.
Actually, because I didn't have a PS1, the fact that PS2 let me play a lot of PS1 FF games actually weighted pretty heavily.
edit:
Now that I think about it, it probably didn't weight all that heavily after all. I did play FF7 and 8 on PC, so FF9 was the only game i needed a PS1 or PS2 to play.