Your search is meaningless. I think a study that is most likely conducted with researcher bias and I would even argue misquoted. If you look at the actual study... it says that Nielsen estimates 400,000 female players in WoW (in the same article you quoted). Wow has around 9 million players right now.... so, using you very study.... that you quoted... if you read the actual study title in the exact same article that you quoted and doing basic math... it comes out to .4%. Thanks for the link though.
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I think Blizzard going against Blizzard to introduce something just because some players want it is a very bad idea. Blizzard is a homophobic company... period. They have practiced anti-gay policies in the past and have never apologized for them. Being gay myself, I can handle that because I play a game to be entertained, not to make a personal agenda statement. However, that doesn't make it any less true...
http://arstechnica.com/uncategorized/2006/02/6129-2/
http://acidforblood.net/2006/01/blizzard-bans/
http://beta.slashdot.org/story/06/03/10/1810219/blizzard-ceo-lays-gay-guild-issue-to-rest
Total non-apology.
http://games-beta.slashdot.org/story/06/01/31/1548241/blizzard-responds-to-gay-guild-debate
Because players can't handle being harassed, and Blizzard can not handle the issue in the game community apparently.
~Now the question being... if they went on the warpath to attack gay players openly 8 years ago... how incredibly disingenuous are they if they suddenly add a gay character just for the sake of diversity... hmmm!?!