I've had some similar experiences, but a different explanation for it. I think that women who are really serious about dancing to start with are more likely to choose ballet or modern over ballroom, so ballroom only gets a fraction of the women who are serious about dance. Of the women who only have a casual interest in dance, though, they'll all gravitate to ballroom because they figure it's easy - all they have to do is follow, right? In the mean time, guys who are serious about dancing are far more likely to be interested in ballroom, where the guy gets as much of the limelight as the lady, than in ballet, where the guy plays only a supporting role. In the meantime, the guys who aren't serious about dance are likely not to even try ballroom - you have to learn to lead and all that stuff. It's easier to just join the company softball team. In both cases, the nonserious outnumber the serious - and since it's nonserious guys that sometimes avoid ballroom, that results in a gender imbalance where there are more women than men overall. But because a lot of the serious women have selected some other form of dance, the guys that are actually serious about ballroom can outnumber the women who are. But it's just a theory, I could easily be wrong.