I didn't know there were quite so many MMORPGs active on the gaming market. WoW is unique among this video game genre because of it's continued growth. The player base for other games have leveled or tapered off. I couldn't even guess where the population will top out. With the popularity of the Burning Crusade and anticipation of Wrath of the Lich King, I would not be surprised to see more than fifteen million WoW players.