Why do people own 7 houses? Or keep working long after they have more money than they can ever spend?
I get that rich people can pay people to take of their problems, but hiring those people is itself stressful. OK so you have the one trusted guy who handles all the other guys, etc..., but these are all still things that come across your desk, eventually.
I guess, to me, money can buy a degree of freedom from hassle, yet so many people who have it choose to not use it that way.