Two things:

1) You have to get it out of your head that it is enough when everyone has X standard of living. It isn't. It's enough when less than a critical threshold of the population is dissatisfied, and that dissatisfaction can come no matter what the median/lowest standard of living is. This is just how societies work, uniformly.

2) Money is a ledger supported by a social contract. Spending wealth in ways that erode the social contract is bad. I think we can all agree 500M dollar yachts, empty luxury apartment buildings, and buying up shorelines in populated areas are all bad looks, and therefore, erode the social contract. The wealthy really need to step in and police each other socially here, if they want to continue being wealthy.