I haven't been able to formulate an answer.
I think I've figured it out. From my perspective, he's asking the wrong question, and that's why I can't answer it.
The question *I* ask is, "We live in a society that conveys many advantages. How can we most fairly distribute those advantages while not constraining personal incentive and creativity?"
I have no problem with people who invent really cool things, or provide really cool services, being fabulously wealthy. I have no problem with the idea that a job requiring 25 years of training pays more than a job that doesn't require that kind of investment.
I do have a problem with a society and culture that treats people who do the day-to-day work of maintaining the infrastructure (by which I mean both public infrastructure like road builders and forest rangers and police and teachers and firefighters, and private infrastructure like custodians and secretaries and house builders and factory workers) -- or who are unable to work because of disability, or who are able to work but cannot find a job because the economy is broken -- as disposable and worthless.