I believe we have a bit of each, real women and posers. It has been my experience talking with friends and their wives in bars about this subject that women are in many ways very much interested in this subject and gauging by the guys present (we may have all been trying to hide our interest) even more interested in the subject of women fighting than guys are. However, I don't believe that it was as much of a fetish for them as for the men, more of a liberating empowering idea. If you look at the chat room most hours of the day, there are generally more women present and active than the men. I am sure that is partially that women are more social than we are, but unfortunately it is also because there is a significant "poser" population in any of these rooms.
As far as the question of if we believe so many are posers, why do we keep coming back? For myself I have never met anybody irl that I met online and I don't do cyber sex or mixed or anything. I am just happy to have somebody to chat with about this subject. So it really doesn't matter if they are "Real" or "Faking" to me. With regard to outing Posers, why would you bother? It is a waste of your time. Even if you managed to get 100% concrete proof that a person were a poser and they even confessed, later that day they would be back with a new persona and profile. What's the point? Just relax and try to enjoy it.
Of course for the people who are actually planning to meet, I wouldn't do anything until there is voice verification and after that web cam verification. If they can't spring for a $10 microphone and a $30 web camera and get an account on Yahoo, they are not for real. Get over it an move on. Also for the ladies, Join Voice Verified on Yahoo. It isn't 100% reliable, but better than an open chat room.
Good luck!