Personally, I got into gaming (and therefore became a "girl gamer", hur hur) because it was just my thing, I guess. My tastes have really changed dramatically over the years, so I don't really think you can say I was drawn to gaming for any particular reason other than that it was fun. I look for good stories and writing, but that's about it; I love Harvest Moon (SHUT UP) just as much as I love Silent Hill or Fallout. Just because a game features things designed to appeal to guys doesn't mean I'm less likely to find it interesting.
I think a big reason, however, why women still aren't as into games as guys are, is because of the way society presents the idea of games as being a "guy thing". Just like how action figures and Lego are marketed primarily towards young boys, girls are, from a young age, encouraged to "be more mature than boys". When I was growing up, I was told I shouldn't play games because it was "for boys", and I guess I should concentrate more on girly things or something. That was back in the eighties, and while I'm sure things have changed since then, gaming is still just presented as something guys do, while we women stand in the background rolling our eyes at how immature dudes are, thinking about important things like quiche recipes.
I honestly think that if people stopped making such a big deal out of "girl gamers" or acting like they're such special snowflakes (we aren't) there would be more of us, or we might surprise you by coming out of the woodwork. (I do think even just featuring more women in gaming media as just people who like games, like Morgan Webb, rather than as eye candy, or even just in the commercials being presented as part of the target audience, you'd have more success.) You don't have to make a certain type of game to lure us in because, shockingly, our brains are only different in the way that every other person on the planet has different tastes regardless of gender. Actually, I think being told that a game was designed to appeal to women would be the fastest way to get me NOT to play it.