They're goal is to sell to each person for exactly the most that they can get the person to pay.
A lot of people get the medication through insurance, meaning they're just gouging another leach.
The insurance will pay because the medicine is just cheaper than what it would cost them if you didn't get it.

If you don't have insurance, they have programs to try to gouge you at more plausible rates that they refer to in compassionate language.

If you're a third world, they try to price gouge in terms affordable for the market.

About the only place they charge a fair price is in places they think the government might just set price ceilings.