I don't know about Andrew, but I guess if Linus sold some of the stocks he got in 2000 at the right time he is probably a millionaire.
The added benefit from having billions instead of millions is very very small in real life. Linus probably could buy a bigger house or an old jet fighter or something, but maybe he just doesn't need those things.
People can be totally happy when they have love, security and a bigger purpose in life. No billions needed.