I know some pretty wealthy people. They are very aware of those who are 10x wealthier than them. If Noam has 1B, he is probably pretty aware of those that have 10B. He's met them and seen their properties, scope, and powers. Likewise, they are thinking about those that have 100B, and those are thinking about Elon, who now has "four commas."
My point is you and I are still working for money because we want things/security etc.. I really don't get the sense that people who have tens or hundres of millions of dollars are doing it cause they need more money. It's other things that motivate people. I run into people in my workplace that just enjoy it, even though they're sitting on 20M.
All those engineers making 20M a year at Anthropic and OpenAI are going to back down to normal super high comp of 700k a year after their starter grants run out, and yes many will quit but the people who stay aren't moving the needle on their finances that much.