Think of difference between buying bunch of cars from someone making cars. Instead of buying the factory making cars.

Or maybe currently RAM. You found pile of money somewhere. You buy big amount of RAM. RAM prices go up, you do not care you have money. In a few years DDR6 comes out. The RAM you bought is not that expensive anymore. You do not really have either money or something currently expensive.

Wealth is owning the land, the machines, the buildings, the knowledge(more so now). Being rich is owning lot of what can buy those things. But if you keep spending liquid wealth, eventually it is gone and you are not wealthy anymore.