>You must sell a house to make a profit.

Renting and leasing economics prove your statement to be a fallacy. Airbnb wealth is built on not selling houses. Retaining bought houses increases the value because it increases the rarity. By restricting home ownership the rental properties monthly prices can be increased to reflect a manufactured market.

De Beers is a great example of how hoarding wealth grows wealth. [0] They hoard diamonds to create an artificial rarity market. This gives the ability to increase prices. Say you have a type of diamond category with 10% natural occurrence. You hoard 90% and only release 0.5% or less of that category. You just increase the rarity artificially and drove that category in price like a rocket. Even if your competition will increase prices to match or be just a few dollars below. Competition has to because they do not have access to the diamonds hoarded by De Beers.

How would you take that 90% of the hoarded 90% category diamond and make it profitable instead of just sitting on the selves? How about grinding some of the them up and selling them for diamond edge saws and bits?

My definition of _Wealthy_ encompasses individuals (you, me, human HN users) and groups of individuals (trust, companies, Apple, Meta, HN, ...).

[0] https://en.wikipedia.org/wiki/De_Beers