It’s also great to the wealthy. Speaking as someone moderately wealthy myself.
Not having to worry about day to day bills, being able to splurge on friends and family for a celebration or when they have an emergency, being able to travel to see things because you read about it in a book and want to check it out, not caring about your credit score and being able to single-handed direct non-profit efforts to achieve civic outcomes they’d otherwise have to spend months fundraising for, all of these are tremendously rewarding. I agree that once folks get into the billionaire bucket there seems to be a negative return on wealth. But going from having to think about the mortgage to not is a major step up in quality of life, and it’s something of a sour-grapes middle class myth that I also grew up with which preaches that wealth isn’t actually all that, hard work is the reward yada yada.
Of course that's also part of why I'll never be in a position to achieve a $40M payday, so there's that.