I believe a lot of MMO fail as larch says many of them are the same, so why put all the new effort for a new dress, unless the old Girlfriend is getting wrinkly :P I played out a few MMO's personally i really enjoyed Metin UK, was there spent 8-9 hours a day on that game, sadly lost every thing to a noob friend. So the main problem is many people also leave because there effort is stolen from them, get board, find a better MMO, go back to there old MMO or just move on with RL.