If anything, one of the biggest benefits of earning more is exactly to not have to think so much about money - more and more things start falling into the "cheap enough that I don't have to care what it costs" bucket.
To me that's the main benefit of earning more. Sure, it's nice to be able to buy more expensive things overall, and e.g. be able to travel more, but I find more value in the many tiny day to day improvements that individually sound trivial, such as not having to budget when at the grocery store. It's a few minutes here and a few minutes there extra where my mind is free to relax or focus on more interesting things, and it really adds up.
There was a year in my youth when I had a big economic setback, and suddenly had to budget my day to day expenses again, and frankly, the time I lost that I had to spend thinking about money, from the small things like how much I could afford to spend for lunch to how to cover rent, was exhausting, and a very stark reminder of how easy my life had become prior to that. And I've never experienced true poverty - I always had multiple safety nets; I'd never have starved, for example.
I think the mental exhaustion from dealing with a strained economy is one of those things people who haven't experienced it tend to don't get when trying to imagine what life is like for people who have little money.