Why do you believe that the pharmaceutical companies should not be able to set their own prices? I also note that you use the loaded term “entitled”, as opposed to the more frank term “deserve”, which is what you mean.
Because the $750.00 per pill is not paid for with private money. It is taxpayer money. If they had to rely upon what folks would willingly pay out of their own private pockets they would not get $750 per pill or any sizeable fraction thereof.