I think I remember reading a quote somewhere attributed (of course) to Mike where he says something like 'Brian stays at home and collects money while we are the ones out touring. No wonder he's called a Genius'. Or something along those lines. Although I think that was back in the '70s.
Have read that somewhere myself. Mike needed to think of it as most artists would think of their manager, who also stays home and takes a cut for doing nothing on stage. No Brian Wilson, no music for the Mike and Bruce shows. At the end of the day, nobody has ever forced Mike to tour.