As a pharmacist for 58 years, I have seen what has happened to drug prices since the beginning of insurance coverage for prescriptions. The price of an Epipen has gone from hardly nothing when it was introduced to $615 for two pens.
Why? Because insurance will pay. Because the public could not afford the approximate $100 co-pays, they give you a coupon for the co-pay. They know for sure that if insurance did not pay they would be out of business.
This is happening with hundreds of medications. The public could not care less as long as someone else is paying. Employers and higher premiums.