Coming from grand fantasia, I've quit because the game was just too P2P, everyone was relying on AP to be a strong soloer and to play alone, which is really sad, now this coming from a player who's actually played for more than 4 years. I've maxed characters and I'm quite well off, still didn't stop me from quitting the game because everyone just wanted to go solo.
I think it's one of the things that you guys might want to look into if you feel like you could start a good grand fantasia server, something that would require people to learn how to work as a team again. I'm excited though if and/when it does come out and will definitely support funding it via donations.