I have read that it is about 1 male Dom to 10 female subs. I am not sure if that number includes those that are actually abusers.
I don't think so, keeping in mind that about 1 of 4 women is in a relationship that is abusive on one level or another. That would make about 2.5 doms for 10 subs...if my math doesn't betray me which is very likely

As for me, I'm female/straight/sub...I think it has to do with our cultural conditinioning that there are more female subs (and consequentely fewer dommes). When I first began to dabble in the wonderful world of BDSM I always thought that if there was a shred of dominance in me, I'd only want to dom another woman, but by now this has actually changed. I'm not really eager to try it out either way, though. The one experience I had with a woman (in a non-BDSM context) wasn't horrible (in fact it was pretty good), but it has definitely confirmed my suspicion that I'm not very bi-sexual. But well, you can't know before you tried! *stops babbling*