Show me a real world example of a promising drug that was never developed because the investment was too costly due to governmental interference in setting the price to the consumer. Name the actual drug.
Do you think that pharmaceutical companies have unlimited R&D budgets? Do they charge full speed ahead and develop every single idea that they come up with?
I'll answer it for you:
NO
Pharmaceutical companies are like most other companies. They have these things called budgets. There are meetings and discussions where various new drugs are discussed and funding decisions are made. They balance development cost against the potential market, and other factors. Some drugs are then developed, and others are not. Even through all of this, many paths taken are dead ends and they don't recoup anything from it. Oh, BTW, government regulations have a direct effect on what it costs to do this development, and our high corporate tax rate has a direct effect on how much money is available for development budgets.
No issues from me if someone uses their purchasing power to negotiate a better prices on drugs or any product. Entities freely negotiating deals between each other is perfectly in line with our Constitutional underpinnings. If however, one of the entities is the government, and they use this power to FORCE someone to lower their price, I have a problem with it, as do all people who believe in property rights. That is effectively no different than a mugger negotiating a zero price for your wallet by clubbing you over the head.