I think ideally in a capitalist society we'd want that to be true. However, cops are paid more than teachers, administrators are paid more than nurses. There's a lot of what you can get away with as well. I genuinely don't think we live in a meritocracy. We also have cronyism and nepotism and corruption. If what you were saying were perfectly true, we would be be having all these union battles would we?

Not profit, but how hard the role is to fill. More supply, less demand in terms of salary.