It's not that women are greedy, it's that they know that, given a chance, most men will sponge off them and let them do all the work _and_ pay all the bills. The thing about being a mom to kids is that you have some control over how much extra work they produce and how much they spend. When you're the mom of a grown man, you don't. So he at least needs to either produce significant income or do significant work, preferably both. Because the woman will also be doing both, and fair's fair.