Normally people create downward pressure on prices by not buying the product when it becomes overpriced. However with healthcare there is a captive market. Are you not going to get a cast put on a broken leg because the doctor wants to charge too much? Are you going to just opt out of cancer treatments and die?

Healthcare is an area where market forces are inherently perverted because people often don't have a choice of not buying the service. This is why every sensible country uses a socialized system instead. Not only does it provide better service, but without the perverse market incentives and multiple layers of middlemen infesting the system it is much less expensive.