There comes a point where it becomes increasingly difficult to "spend what you earn." I mean, you can do it with dedicated effort, of course, but even if you're very in-the-bubble, it's hard to think of buying ultra-expensive commodities (boats, art, highly expensive cars), or your third or fourth house, or other things that can plausibly eat up tens of millions of dollars in a year, in the same category as, like, "Well of course I want to send my children to a swanky private school instead of public."