Doctor Strange is selfish but he's still saving lives.
If you go into it, it is marriage that has created prostitution. And prostitution will never disappear from the world unless marriage disappears; it is the shadow of marriage. In fact prostitutes have been saving marriage. It is a safety measure so the man can go once in a while, just for a change, to any other woman, a prostitute, and save his marriage and its permanency.
Try saving when your salary is low. So after making more money, you will not be able to do this anywhere