You keep telling yourself that while the real gamers spend thier lives playing games.
The real reason I'm not averaging 100 hours a week play games is because my 360 AND PS2 broke down, and I'm stick with a Wii and half my game selection playable.
You also forgot games like The Sims (which makes up for games made for "boys"), MMORPGs, RPG's (like Final Fantasy), and other such genres, as well as puzzle, arcade, and yes, some females perfer sports games (like Madden, NBA Live, NHL, FIFA, ect.).
There is no real limit of games women are willing to play. So just because games like Barbie, Nancy Drew have a very narrow scope of play, other better games are stepping up to appeal to women as well as men.
BTW: My sister and my 50+ year old mother averages at least 80 hours a week on The Sims 2.