Half of everyone on the planet plays World of Warcraft -- that's just scientific fact -- so, it shouldn't come as a surprise that the game's recently released expansion made quite a splash on its launch day. According to Blizzard's calculations, the Cataclysm add-on sold 3.3 million units within 24 hours of its release, becoming the "fastest-selling PC game of all time." The previous record holder? World of Warcraft: Wrath of the Lich King, which sold 2.8 million copies in one day back in 2008.

Frankly, we're a little appalled at Blizzard. Like, they've obviously found a golden goose here. Why not let other developers create World of Warcraft expansions as well, giving them a chance to capitalize on this lucrative market? Why are they being so darn greedy?