World of Warcraft Brings in Over $1 Billion a Year

Next Generation reports that Vivendi Games is enjoying another year of record profits, thanks to over a billion dollars in World of Warcraft subscription fees.
Irvine, Calif.'s Blizzard Entertainment was the driving factor once again for Vivendi's games division, generating €814 million, an increase of 58 percent.

WoW's subscription base increased by 2 million over the course of the year, reaching the 10 million subscriber mark. US subscribers pay about $15 per month for a WoW subscription.

I wonder how much of that money actually goes to the guys working on the game every day.