If being an “earner” is a major source of your income, you aren't in the upper class (haut bourgeoisie) in a capitalist society.
If being an “earner” is the major source of your income, you aren't in the middle class (petit bourgeoisie) either, just a (potentially highly paid) member of the proletariat—a wage laborer—even if you might happen to be from the proletarian intelligentsia rather than a manual laborer.
Think about that this is the best case scenario for people making more then 95% of all other Americans, and we are having a discussion if they should be able to drive a Volvo, or eat more then beans and rice. The point your missing is that to even have that discussion you need to be in the top 5th percentile. How are the other 95% of people making ends meet?