In the end it's all relative to your expectations. For example let's take 2 different people; "A" and "B".
"A" has rich parents (few hundred million). "A" has rich friends. "A" enjoys expensive past-times. "A" currently lives off around $1,000,000 per year (mortgage, food, entertainment, etc.). Most of "A"'s associates have a similar lifestyle. If "A" loses all of his money and is forced to take a job at $150,000 a year then he'll be absolutely miserable. He'll feel poor because all his friends and associates have so much more, and because he's become accustomed to a way of life he can no longer afford.
Now person "B" has a blue collar job, no savings, and makes $50,000 per year. "B"'s parents are not rich, but were always able to put food on the table. "B"'s friends and associates all live fairly similar lifestyles. If "B" is suddenly handed a magical supervisor role that pays $150,000 a year he'll feel absolutely rich. He'll have more money than any of his current associates. He has more money than he even knows what to do with.
Both "A" and "B" now make the same amount of money, but "B" is happier than "A" and it has everything to do with expectations, and since they have the same amount of money, then money must not be a direct factor.
You can keep taking this further until you hit a point where there's not enough money to cover bare necessities. This means that every single $ you make above the bare minimum to live a healthy life is unnecessary if you manage your expectations. For many of us it's easier to make more money than manage our expectations though. If you're barely scraping by on a $100,000 salary, maybe it's time to step back and examine your expectations and priorities.