If you have tens or hundreds of millions, I imagine you could find ways to do the stuff associated with billionaires without spending anywhere near as much. If you want to fly on a private jet, you can buy a fractional share. If you want a mansion, you can buy almost anything, you just don't buy a dozen and forget about them. You would just have to have a scaled up middle class budgeting sensibility instead of viewing your wealth as unlimited.

If there is anything that really is limited to billionaires, it seems to me logically it's going to be status, proximity, location, attention that are in limited supply. Not material things.