A powerful, famous man with an intelligent, beautiful wife pays the price of a small home for sex? What’s wrong with this picture?
He’s not paying just for the sex or for them to go away. He’s paying for something special. It could be a number of thing - bi-sex, S&M, tower of power, strangulation. Otherwise, if it was just straight sex, a mistress on the side would be fine.
The grass is always greener to some people.