The drug market does not work like other markets... it is not really what the market will bear as there is not a single buyer vs a single seller...
The drug companies are gaming the system....
I was reading about one company that had a drug that 'cost' $100K... but the drug company was aware of the problem some people would have paying their share... so what did they do
Reimburse that money back to the patient!!! SOOO, the patient was not out any money so was not complaining... and in fact was saying they NEEDED this drug even if the insurance company did not want to pay the high price... So, the drug company nets $80K from some people but $100K from others.... where if it were a free market it might only cost $20K... (which, IIRC, it cost overseas)....
That is what Mylan did to try and get people off their back... they did not reduce the price since they want to get the maximum from the insurance plans that pay most of the drug costs... so if you have a $20 or so copay you do not care that it cost $600...
https://www.epipen.com/copay-offer