What's so great about World of Warcraft ?

There is no doubt that the wow is so great. More and more people all like to play the game. They even spend most of their time and money on it. and the wow gold sellers are more and more. You can search lots of sites selling wow gold in Google. w w w.u g a me g o l d.co m is also a site selling wow gold. And players all like to buy online too. What's so great about World of Warcraft and why are so many people obsessed about it?

I personally don't like it at all. It gets very boring after so long. I think many people are addicted to it because it's almost a life simulator. Peoples "lives" in Wow are more exciting than their real lives. Another possibility is because of the Reward system, players like to be rewarded so they keep playing and playing to get the rewards because it makes them feel better.