Rich, powerful men often acquire High Maintenance Mistresses, who are always threatening to commit suicide unless their boyfriends divorce their wives immediately and marry them, only to eventually be placated for the time being with diamond tennis bracelets. That can really chew up a lot of time.
Others, such as Mark Zuckerberg, prefer a Low Maintenance Girlfriend or Wife who will afford them the concentration to put in 16 hour days at the office.
You have to give Arnold Schwarzenegger some credit for creativity in pioneering the concept of the Negative Maintenance Mistress. Sure, she might not be much in the looks department, but she not only didn't expect to become the second Mrs. S., but she kept the living room spotless. A no drama mama, ideal for a busy superstar.
Actually, I think Stalin beat Arnold to this concept. As far as historians can tell, after his second wife committed suicide, Stalin, a busy man with a Great Terror and a World War to run, simply slept with his housekeeper.