Old post, but w/e.
I would say a good percentage of players stick with WoW because it's familiar. You don't need to learn a new game, you don't need to feel like you'll lose progression from changing games, etc. It's also a game that you can play without "doing anything". Countless hours/days/years have been spent with players jumping around from tile to tile in major cities, not doing anything, but still doing something.
I suggest you give Vindictus a try. It's got a unique combat system that's very easy to learn, but can be difficult to master (depending on class and spec). It's free and you can acquire it via Steam. The bosses are some of the coolest imo. Very good armor and model textures as well.Are there any other mmo's out there currently? I played Secret World for a few months, it just had terrible end game options.