This certainly has been my experience and that of my friends. Its why I originally wanted to work with followers... in conversations, I found that they felt that they weren't getting any good instruction in the classes, and I saw for myself that some were making very elementary mistakes in classes that the teachers ignored because they were too busy correcting the leader's steps to complete the sequence.
It seems the pattern goes like this...
Beginner/ advanced beginner classes: too many women, not enough feedback given to the women.
Some women stop coming to class (this may be why some people think that the women are not interested in improving... from what I can tell, they just aren't interested in spending money on
someone else's improvement!)
Intermediate class... too many men. Still not much feedback for the followers. The women who decided to come as leaders because there were never enough leaders (and they got tired of sitting out waiting for a leader in the rotation) are now pressured into following because there aren't enough followers.
So they STILL aren't getting what they paid for. Even when they do lead, the teachers often figure they are just doing it to kill time and don't give them any feedback as leaders either! I actually had a teacher approach me once while I was leading and ask "You're really a follower right?" and then proceed to ignore me for the rest of the class! I guess the instructor figured there was no point in working on my lead since I was "really" a follower.
And there's the added problem of leaders taking classes they aren't ready for, so that the followers have to dance with leaders who might hurt them. Then after an hour or more of being led badly, the teacher finally notices her, and the follower gets correction on something she normally doesn't screw up because she's got a sore back or something. Now she's thinking... "great... I finally got the teacher's attention, and all the feedback was on something I already KNOW I'm messing up!"
(
not that this has ever happened to me 
)
Sometimes the teacher pairs a better follower with a struggling leader to help the leader along (we all know that learning to lead with a follower who can't follow is pretty hard right?) That's great for the leader, but the follower is paying for the class too and would like to get something in exchange for her hard earned bucks besides the joy of helping a leader who shouldn't have been in the class in the first place. I know more than one good follower who has dropped out of a class because the teacher always asked
her to dance with the slow learning leader, and then ignored her.
Now even MORE women stop coming to class giving rise to even more of the theory that followers don't think they need to improve. What's REALLY happening is that followers have figured out that the opportunities available to them are NOT improving them.