Having sold 3.3 million copies of World of Warcraft: Cataclysm on the first day, it was easy to guess that the MMO expansion would have little trouble going on to record-breaking sales in its first month on the market. And that's exactly what it's done, according to Activision Blizzard, who reports that the title sold through over 4.7 million copies since its December 7 release. And unlike the usual retail sales numbers, that includes both packaged copies and digital distribution.

According to Activision, that sets a new record for monthly PC sales -- again, it's not a huge surprise to believe WoW has the power to break sales records. Here's what is surprising, though: Activision said that the WoW community is currently over 12 million players strong. Who are the 7-plus million people who play WoW, but didn't buy Cataclysm yet?