World of Warcraft's fat market share
This isn't surprising, but World of Warcraft has over 50% of the MMO market. That's a big twinkie. Of course, being the MMO stranger that I am I had no idea Lineage was as big as it is. Between its two games, it has over 20%. Everyone else picks up the scraps. Its good to be Blizzard. Now, you think they could use all that cash to come out with a Starcraft or Diablo sequel? Its time.
I got this link BTW, from this rather interesting look at the state of the game at Slate, complete with ideas on where it should go from here.