The only "fair compensation" is whatever two people agree on. Beyond that, "fair" is meaningless, and is often used as an excuse for state violence. Unless people commit fraud, in a voluntary market even the most selfish, greedy businessman has to benefit his CUSTOMERS in order to benefit himself. See that computer in front of you? YOU have it, not because all those involved give a crap about you, but because they wanted to enrich THEMSELVES. You benefited from their "greed."