Look, its pretty simple. Here's a microcosm example: There is a German ship-builder that exclusively builds luxury yachts. They have ~2,000 highly skilled craftsmen, engineers, etc.

This company only exists because wealth is concentrated enough to support a market for it.

That company consumes about 4 million skilled-labor-hours a year to provide this service.

This means that skilled-labor-hours are more scarce/expensive for _everyone_, because the on any given year, there are only so many skilled-labor hours that exist. These labor hours require about three decades of investment from society to produce (public education/childcare/etc).

Bezos may not buy a super-yacht every year, but as a class, the super rich consume an insane labor hours.