The difference between our profession and the medical profession however is that, unlike ours, software development, whose skills can be acquired at basically no significant cash cost (other than a cheap desktop PC), many doctors have to begin their careers with tens of thousands of dollars in debt, assuming they could afford it at all even with loans. I don't think we should begrudge medical folks for wanting to be paid, and paid well, as long as that is not the only thing they are in it for.

What makes you think doctors don't work pro bono at times? Both my parents are physicians and I know they sometimes volunteer their medical services for no cost. Even hospitals sometimes volunteer resources but physical goods aren't free or cheap.