Only rich men can have four wives. Many men struggle financially to even have one wife and to even raise one child. Many men spend years trying to find a job and then they spend years trying to become financially stable enough to get married. For many men, even providing for one wife and one child is like a blessing.
Whereas, rich men have the money to provide for their four wives and children and they even provide separate houses for all their wives whereas an ordinary man might spend his entire life just to buy one house for his one wife, so polygamy has a big connection to money also.
Thanks for reading!