Blizzard hasnt made out as well as you might think. Or at least blizzard as a whole. Vivendi has though. A buddy of mine who works as an artist and knows a few people from blizzard told me a lot of the senior WoW employees left because of dissatisfaction with how they were treated in terms of compensation because it did so well.
Long story short, you might know another game they put out, called guild wars
