The concept that Star Trek embraced where everything in society was based upon merit is an anathema to erasing financial considerations.
You can never, ever, I don’t care that aliens show up, erase the desire for more. More power, more money, more women, more drink/food etc.
Enemies at the Gate pretty much summed it up when the political officer sacrificed himself for Zaitsev. Men will always be richer in some areas, in that case the love/devotion of a woman that didn’t love him back.
If you can never erase the desire for more, for competition, for love and affection you cannot erase the concept of money.
Yes, it’s nice that people in Star Trek would be free to be the best curler without having to work at Home Depot for minimum wage and living in a trailer.
However you could never turn off the human nature that drives a Hitler, Putin, Jobs, Gates, Rockefeller or Carnegie.
I know, especially since so many story lines actually dealt with that which was supposedly nonexistent -conflicts and problems caused by human nature- and many aliens also exhibited that same human nature. Many episodes featured megalomaniacs or mad scientists etc.