And there's also Will...uh...don't remember his cosplay.com username but he did a skit at Otakon where he was crossplaying as Sakura from CardCaptor Sakura and the first thing he said was "Let's get one thing straight. I am not gay. I like girls. A lot. I like them so much, I sometimes dress up like them." I thought that was a very good quote for those non-gay crossplayers.
Now, quite honestly, I see an equal amount of both non-gay and gay crossplayers. I've conversed at cons and on the boards with plenty on both ends. Both guys and girls alike. So far I really can't say that either sexuality is dominant. And I also think it really shouldn't matter.