My sisterwife's mom was divorced and she remembers her mom watching a man at the airport helping his wife and kids and commenting about "That was all I wanted" wishing she had the steady support that woman did.There are many single women who look at married men who treat their wives well and wish they had a guy like that. I honestly think if it was culturally acceptable you would see more polygamy.
I think more would do this if they knew it was possible....and how great it could be.