I worked with a doctor whose in-laws were Saudi royalty. He didn't need to work at all he was so wealthy.

I heard about him doing an incredibly greedy thing that blew my mind one day; he showed up at a dinner that a drug company was hosting for another adjacent program he had nothing to do with and did not practice in at all. He didn't even tell them he was coming, they had to find him a seat, and then he sat down, ordered not one but TWO whole lobsters, and when they came he asked for them to be wrapped to go, and he left. Even acknowledging drug companies have large budgets for these kinds of things, to come to an event that has nothing to do with you and do that is insanely rude when you don't want for a thing in the world.

I know someone else who is very wealthy, and he's pretty generous and passionate about creating things, he's far from perfect, but truly wants to make good things and runs a business that gives him zero profit, so the contrast was pretty stark. The doctor also stiffed his professional college for a very large membership bill.