Hell, one can support the median household income at a reasonable SWR on ~ 2M.
Underlying all of this seems to be paulg's assertion that billionaire founders 'deserve' their wealth and therefore our inequality and their relatively small contribution to the public purse is justified.
I have no problem with founders being rich, but once you're earning 1%er income? You should be paying a hefty amount of taxes to support social spending. Think ~ 2/3rds, like it used to be before the regans and thatchers of the world gutted the social contract in the 80s.