Because, as shocking as it may seem, the world is not black and white. There are intermediates between “dirt poor” and “billionaire”, as well as “lying, exploitative scumbag employer” and “perfect employer”, and also blind luck.
The simple fact that a significant part of the population is systematically paid less than the other for the same work should tell you that you are overly optimistic.
Half the people will always be better in any metric than the other half.
> The simple fact
Saying it's a fact doesn't make it one. I've run several businesses. In no case did the secret cabal of businessmen contact me with the rundown on how to systematically pay half the people less.
> blind luck
It's necessary for you to set yourself up for luck to find you. Luck will not find someone playing video games in the basement.