According to data obtained by Gamasutra, World of Warcraft has sold 8.6 million copies to date in the U.S. since its launch in November 2004. The number was provided by the NPD Group, which is a market research company. This data includes the base game, the collector's edition, the Battle Chest, and the two expansions.

While Gamasutra wasn't able to get information on average sale prices, the staff uses a price of $30 for each unit sold to estimate Blizzard has earned as much as $258 million total from U.S. retail alone. And since the company last stated it had 11.5 million subscribers worldwide in December 2008, the money just keeps pouring in through subscriptions.