WoW is the cash cow that keeps on squirting liquid gold from its money udders. Wow, that was an uncomfortable sentence.
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Blizzard's MMO currently has 11.5 million subscribers, most of whom will probably buy copies fairly quickly. This expansion is sure to set records and make huge stacks of money for the developer. Cataclysm will cost $39.99 at launch and will work with both PC and Mac. A collector's edition will be available for $79.99.