I have "expensive" hobbies, but that mostly entails a high upfront cost ($2-3K) for gear that will last a decade minimum, so its not a huge issue.
What the hell are (somwhat rich) people doing with their money? I'm confused since I don't know what there is to spend big money on. Health care is a thing, but I assume high paying jobs have somewhat decent insurance that shouldn't bankrupt you immediately. There are only so many $20K watches and $75K cars you can buy before it just becomes pointless.