Certainly, people spend more if they make more - but not proportionally to the increase in the amount they make. That's why we have things like the stock market and 401k's and mutual funds and venture capitalists and various other forms of investment. Because the millionaire doesn't use as much, proportionate to their income, in toilet paper as the 25 thousandaire. They both use about the same amount. After the essentials, you have the "fun" stuff - TV's, cars, boats, etc. The millionaire is going to pay more for high-ticket versions of these things, but not enough more to come close to keeping pace with the disparity in incomes.
It's much easier to spend a million bucks than it is to make a million bucks. And a millionaire knows that. Their lifestyle will not be 20 times greater than someone making 20 times less. It'll be somewhere around 5 times greater.
(Again, I'm making up numbers to demonstrate the point.)
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