I look at it from the angle of the legal profession - for decades the "billable hour" was the only way anyone billed and clients absorbed all the inefficiency and frankly overbilling that went on. It's still the predominant model but you see a lot more fee for services arrangements now - $10K to get through summary judgement phase, $25K if it goes to trial, etc., as opposed to an open-ended meter running for every 6 minutes that any person inside the firm ever spends thinking about your case.
The anesthesiologists are still on the billable hour. Obviously they don't want anyone messing with it.
Then there's the fact that Obamacare made it (health insurance) into a cartel, removing any real competition - there is no longer any option to provide "cheap" insurance (to cover only catastrophic losses). They all must cover pre-existing conditions. Must carry adult children until they're 26, etc. So now every insurer must cover a larger set of services (with the requisite staff and administration that comes with it) and providers know it all MUST be covered, so there is a lot less pricing power.
Plus, doctors enjoy a wonderful reputation so they are immune to the Eat the Rich sentiment that is prevalent in every other aspect of our population.