I agree with you. When I was less experienced, I usually went to BDSM forums and the situation was awful. I could not get any dominant woman because there were very few of them, and there were hundreds of other men who wanted them, but when I became friends with women in my university, I realized that half of them were dominant.
So if you want to find a dominant woman, the university or even the street is a better place. You will not be lucky to be in those BDSM fucking associations.