how much you get paid is a function of the value society puts on your skills divided by how common your skills are
This is a statement of fact, not opinion of what ought to be. Part of what Gates (and others) are saying, I think, is that to have a better functioning society, we need to increase the value society puts on teaching.
If we provide the educational opportunity that Bill Gates, John Resig, or Larry Page got to every child in America, we will all be a lot better off.