There are primarily three reasons why healthcare is so expensive in the United States.
The first is because the administrative costs are much higher than in other developed countries (about 25 percent). The second is because the U.S. spends much more than other developed countries for the same things (e.g., drugs, doctors, medical equipment, services). The third is because people in the U.S. receive more medical care than people do in other developed countries (for example, they're much more likely to get expensive surgeries).
A cheap, catastrophic insurance coverage plan for young, healthy people addresses all three of these reasons.