"fair" involves a value judgement and requires a moral system. "even" is pure mathematics.

> I think it's fair to say that some jobs do actually deserve to be compensated more highly?

Agreeing with that is easy. Agreeing with which jobs should be compensated more highly is hard. Because everyone has different morality systems.

> To me it seems that the problem is how much wealth is concentrating in such few hands

I know people who strongly believe Bezos and other billionaires are being <fairly> compensated for the value they've brought to their customers via their businesses.