There is very little true price discovery going on when the largest payer for healthcare services has absolutely no choice to purchase the product at a given price. All they have to do is get a new treatment approved (i.e. show that it works and is safe), and then the government has no choice but to buy it.
I don't see anything wrong with Gilead charging $84,000 for curing a disease. I just see something wrong with the stats not being able to take it or leave it.