I don't think salaries are why healthcare is so much more expensive: This would account for some costs, but not all of them. The healthcare system in the US is really fragmented and wasteful, so resources aren't pulled together to give the people the best benefit. Heck, we don't even standardize health insurance codes so that offices can hire fewer people nor are there standard costs for the consumer through an area (easing billing a bit), nor protect doctors from unreasonable false malpractice claims.

Not only that, but part of the reason salaries are higher is because of the cost of becoming a doctor... or nurse or any other healthcare professional that requires a degree.