Blizzard generated $704 million in profits on revenues of $1.3 billion in 2008, according to regulatory filings. Analysts believe most of those results are tied to WOW. (emphasis added)
If the "analysts" are right (I wonder how many of them have even played WoW?), then my initial dollar estimates were a bit low, but not terribly inaccurate, while WoW's relative share of revenues/profits was likely more accurate.