While doctors are paid quite well, the burden of expensive healthcare cannot just be attributed to their salaries. The amount of money they are being paid is a mere fragment of healthcare costs in general. Also, by incentivizing doctors with such wages, only the best and most dedicated students enter the field. This means that medical malpractice cases are much lower and the amount paid in insurance claims, and other medical-related costs are much lower. This drives the cost of healthcare down and not up.
Also in almost every industry, the amount of education and training justifies the money workers are paid. In America, doctors study and train for 11-16 years. During this time, they have garnered a large opportunity cost fee. Their future salaries recompensate them for the missed time and help them pay back massive student loans. Economically speaking, their salaries are justified and these wages are not making healthcare as expensive as it is.