I bought a PS3 because I used to have a ton of disposable income, already owned a 360 (which I got for BD, LO, and

Gears*

)... and wanted a PS3 for MGS4 and FFXIII which at the time was still exclusive.
As for me, I am up to the final dungeon and am absolutely in love with Ni No Kuni.. yeah it can be a bit fetch-questy in parts, and have some filler stuff like the alchemy system and monster feeding (kinda getting sick of alchemy and harvesting in RPGs, it was cool when the Star Ocean games did it and it was novel, but now it seems like every RPG has some variant on it), but it's very expansive with lush graphics, a lot of charm, great localization... it has a casino, arena, sidequests galore, world map with lots of little secret areas... all that shit you have missed in RPGs over the last 2 gens is now back in beautiful luscious HD graphics. It may be my second favorite RPG of the gen behind Xenoblade.
*I LOVE Unreal Tournament and have been a fan of Epic since the days of ZZT, but Gears I felt was so slow, ugly and hated its characters.