I must say I've met plenty of wannabe subs, (I attract them like flypaper) and it's never been a problem. It never gets very far and is a fun excercise. I'm pretty good at spotting the fakes, and I never pass up some good sex. It's not about being emotionally abusive, only showing her the fast and hard way how she's not really submissive. We always laugh about it afterwards.

Learning what you are not is in my opinion just as important as learning what you are.

edit: and then we've got the submissives who think that just because she's into let's say...spanking that she has to accept the whole package, which is off-course false and is nothing I'd like to call wannabe. Just inexperienced.