Here's another argument against your idea, completely unrelated to the snake oil rebuttal: If patients could just buy unapproved drugs directly, why would they

Here's another argument against your idea, completely unrelated to the snake oil rebuttal: If patients could just buy unapproved drugs directly, why would they sign up for a clinical trial where there is a good chance they get the placebo? Keep in mind that even if there are a lot of people taking a drug, it is incredibly difficult to see if it actually works without a randomized controlled trial. And a big problem with clinical trials today is recruiting enough patients for the trial. It's difficult and expensive. If the pool of patients wanting to enter the trial was smaller, less trials would get run and we would learn less about which drugs actually work and which don't.