Yeah - that always pissed me off too. A doctor, like a lawyer, is trying to get you out of a bad place.
THAT said I don’t think either Doctors or lawyers should be paid unless they win...
If I took my car to the mechanic and he couldn’t figure out what was wrong, made shit massively worse, and dropped my car back off with 3 new bullet holes I don’t think his demand for payment would be reasonable.