World of Warcraft has added another half million gamers to its subscriber base following the launch of the Wrath of the Lich King expansion Currently, Wrath Of The Lich King holds the record for fastest-selling PC game of all time, with its predecessor The Burning Crusade coming in second. Moreover, the game in general continues to be the biggest, most popular MMO to date, even though it came out four years ago, and with 500,000 new subscribers in just two months that doesn't seem to be changing any time soon.