The problem with that mindset is that money is a proxy for the Marxist idea of inherent value. The distinction does not matter when you are just an average dude

The problem with that mindset is that money is a proxy for the Marxist idea of inherent value. The distinction does not matter when you are just an average dude, doubling your money doubles the amount of material wealth you have access to. But once you control a significant enough chunk of money, it becomes clear the pie doesn't get any bigger the more shiny coins you have, you only have more relative purchasing power, automatically making everyone else poorer.