It's a massive, intricate, and lush world with tonnes of things to do, tonnes of quests to conquere, an entire online-civilization of which you swear allegience to, and a group of online friends you get to know over several years. While I don't play it (my friends do), I can comletely understand how it would become a person's entire world, and thus cause addiction. I mean in your mind's perception, which world is really more real? Which one is better, has more success, more control over your life there?