Ok if a man is rich and his wife is not and they have a divorce, what's to stop the kids from staying in the mans care?
The entire issue is that the courts and society always discriminate in favor of the woman above the man or the kids, even if its the woman wanting to divorce, all she has to do is cry her eyes out, bat a few eyelids tell a few porkies, and she automatically gains custody of the children and 50% of their marital assets, even if the man is capable of looking after and paying for the kids upbringing.
After most marriages, men have to struggle for years to gain custody of their children even if their ex wife is completely unfit to be a single parent in comparison. See the thread right here somewhere where someones kid was forced to drink his own urine.