Earlier quoted context omitted.
It's not just that, it is that women have the greater bargaining chip in the relationship. They have the womb for creating babies, so they can make more demands. Also, they make the greater investment into kids (at first, at least, over time it can change), which also warrants "compensation".
I'm not sure what they're supposed to be bargaining about in your view. Have you ever been in a long term relationship? Because what you're describing does not sound like a healthy relationship.
And, as always: on average...
If you don't see it, I don't think I can convince you. There is much to learn about how the world turns.