A
truism usually uttered by whingers who don't understand
supply and demand.
What you earn never has and never will reflect what you deserve. Rather, it reflects how difficult it is to find someone to replace you.
Salaries have nothing to do with how amazing your skills are- but they have everything to do with how many other people can, and are prepared to, do pretty much the same thing.
Money is not a measure of morality. It is a measure of resources.
See also:
Supply Curve
Demand Curve