Many years ago, Mary said, as we were bemoaning our finances, "We would make good rich people." Meaning we'd be good to our staff, spend our money wisely etc. so it's kind of becoming a saying between us.
Now NYLottery has a new ad campaign where they show some rich person doing something really stupid, like bathing in champagne, and then the announcer says something like, "Admit it, you'd make a good rich person." Meaning you wouldn't do anything that stupid.