I stay because the people I met in 1.0 .. I love them, being with them.
It's not as easy to stay close to your friends in 2.0 as 1.0 because the game's environment has changed into "you can do (most) anything by yourself" that and the endless gearing every 3 months has warn me out because I dont want to just be one job. I really could care less about the nods to FFIV and stuffs. But in the end If it wasnt for the people I found in 1.0. I probably would've left a while ago.