It's a pretty obvious answer, to be honest. Because it's a poorly regulated industry for the purposes of minimizing cost to individuals. Over time, industry participants will continue to expand rent seeking practices and because the demand for health is almost perfectly inelastic, they can continue to get away with it. Too many middlemen, too much needless complexity, not enough regulatory oversight.
I'm a rabid defender of the free market, but healthcare is not a regular market because nobody chooses to purchase healthcare services. You take them at whatever price they are offered whenever you need them. It's why we call users of these services "patients", not "consumers".
Consumers are best served by private companies competing against each other in a nearly perfectly free market to offer the best goods and services at the lowest prices. Patients are not.
Patients are best served by a well regulated industry in a nearly perfect not-free market in which their needs are prioritized over profit. Healthcare, just like education and security, are the foremost duties of the State.