WoW has eight million subscribers worldwide, and 2.4 million bought the expansion in the first 24 hours that it was available in retail stores.
Blizzard says that 73 percent of the 1.5 million World of Warcraft players in Europe, or 1.1 million, bought the game in the first 24 hours after release. In the U.S., where WoW has 2 million players, 1.2 million copies were sold on the first day.