Somewhere, sometime long ago before the mists of my mind became more like a tooley[sic?] fog, I vaguely remember something about a hierarchy of desires or hierarchy of motivation, or somesuch. Money was cloe to the top but not actually at the top; power was at the top.
For one motivated at that level, "that they can make tons more on the outside," is not important. These guys want power; purely and simply, the ability to tell someone else what to do, but not have to do that themselves.