Perhaps my sample pool is skewed, but the billionaires and centimillionaires I know live pretty modest lives in general - yes, they fly first class, stay in the best hotels, and all that jazz, but they’re unpretentious, and you wouldn’t know them from the upper middle class family sat at the next table. In fact, one I know regularly gets weird looks because he’ll be in some elite country club in his coffee-stained slacks and threadbare jumper - but there’s the rub - he doesn’t care. The guy who looks rich is probably up to his eyeballs in debt. The guy who looks like the janitor probably owns the place.
I think the single biggest thing wealth buys is not giving a shit what other people think. You don’t have to play status games when you know you’re the big dog in the room, even if nobody else knows it. I mean, I take perverse joy in showing up at places looking like I just crawled out of a gutter, because I know it doesn’t matter - my money is good.