I think the way to put it is: value/productivity inequality is an inevitable fact of life. We should support economic systems that maximize productivity/value by rewarding those who can produce the most of it. However, money income is a profoundly imperfect proxy for value/productivity, because it can only measure excludable property and services.

Which leaves us with the trouble of: what of people whose work-product is not excludable? This means precisely jobs like teacher, policeman, research scientist, programmer (if programs were so easily excludable, we would all still be running shrink-wrapped packages we bought at Software Etc).