Different Shiurim

I have wondered about this many times, and I have never come up with a satisfactory answer. it is just a curiosity in my mind.
Why is it that most shiurim for women cost money with an entrance fee of some sort, while most shiurim for me are free.
Obviously there are some shiurim for women that are free and some shiurim for men that cost money to attend, but for the most part, the overwhelming majority of shiurim for men are free and most shiurim for women seem to cost money.
Any idea why that is?
And no, I am not saying people who give these shiurim dont deserve to be paid or that people must teach for free or that people must be able to go to classes for free or that everyone has to pay. I am not saying anything of the sort. Just wondering why usually women have to pay and usually men do not have to pay.
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