Ofcourse: Is polygamy supposed to be mutually beneficial? I don’t see any source for that. Why WOULD any woman want to share the poor nebish? It’s him who wants it.
It’s clear how men can and would gain from it but why would women want to allow it? You said money, so I brought that statement to its logical conclusion.
I would have said that because women would rather live with anyone than as a widow, they would prefer to be married even in a less utopian situation.
Baruch Hashem, Women can’t be forced into marriage in Torah law.