Mostly because it's fun and easy to play, unlike some other RPGs. Even when you finished it.
And some stuff I just think is funny. Like how overly optamistic and naive Sora is.
I just found something really funny today, right after Goofy and Donald give you the Fire spell and Dodge Roll ability, Leon and everyone are by the set of tables and stuff in the 1st distrect.
and when you talk to Leon his like so worried about all the dolmatians. xD
and then Yuffie says how cute he can be. (>_<)
I never noticed that, and I have a saved file right before you fight Leon that i like to play sometimes, so I've done that part like, 7+ times. (>_o)