But many people think they're worth that. I don't think there is an intrinsic "worth" for each developer, demand is high, supply is low, that's why salaries are high.
Well, I believe that as humans they are worth enough to eat, live, and enjoy life, at the very least, but from a surviving-in-capitalism perspective they can't pull their weight for a while in most cases. I'm not arguing against hiring and paying juniors a living wage, just noting that it takes a while and some diverse experience to get most of them over the hump, so to speak.