I think one of the main reasons that guys try to flirt with "gamer girls" is that they find the idea of a girl who plays Black Ops or MW2 (Halo, whatever you want) so out of the blue they are surprised. They also find the idea of a girl who plays games so damn sexy they become obsessed, since they are addicted to the game themselves. On topic (ish) I get it the other way round. I even met my gf playing minecraft. Just a random meeting on a server though. Weirdly, I once had a guy (I'm assuming he was gay) trying to hit on me. Fortunately I then lost my internet connection. Still, I never try to hit on girls online, just the occasional sandwich joke, which they usually laugh at.