The book specifically mentions making money, not earning it. The difference is that I can earn money by creating something that lacks value, and by having money change hands. If I create something of meaning, then by giving it to other people I lose nothing, and the money I earn is money made by the creation of value for reward.

"significantly nobler" is a means-nothing phrase. Nobility as a word is meaningless without backup. I would argue, to counter your point, that Steve Jobs has inspired more people to create beautiful, meaningful things than most teachers ever do. Teachers serve a purpose, but theirs is not the only noble trade in the world.