To me, Money is a terrible measure of happiness and worth. There are unlimited extreme examples of terrible rich people and great poor people and vice versa.
As for the OP, I do believe it is envy and the current Borg mentality among some.
Why Are People So Concerned About How Others Spend Their Money?
It's really tiring. Audiophools, Snake Oil, why buy this/that. I don't give a rip what others do, although I like to read about it but none of my business. I'm just not geared that way. People want to buy a Lambo, 10,000 buck cables, 100,000 buck loudspeakers, it's no skin off my nose yet some people are obsessed with what others do. I don't get it.