If they were simply workers, and not business owners, my guess is they would have bailed out long before. Being the owner of a successful business is a far cry from being a 9-5'er. I'd imagine it's intrinsically rewarding to grow your own company

I think the more salient point is that there is no natural endpoint to whatever it is that you think you're doing.

Sold more EVs than any other company? Go into space, and try to sell batteries!

Built the biggest e-commerce company in the Euro-sphere? Go into space, and sit in on board meetings while it gets even bigger!

I get it. I'm pretty sure they don't!

Although Bezos has stopped running Amazon in order to do what he loves, Blue Origin.

And Elon is already doing what he loves.

If either of them had been commuting to a cubicle to work for BigCorp instead, they might have stopped at 10MM.

Fairly sure there's a lot of people at amazon and elsewhere who've passed that threshold and are still working. Sure, maybe they "love what they do", but that seems like a relevant point, much more so than the US$10M.