Is it really so terrible? What if you found that some orphan drug could be used for something that nobody had thought of, after the patent expired? You'd need t

Is it really so terrible? What if you found that some orphan drug could be used for something that nobody had thought of, after the patent expired? You'd need to spend a lot of money testing it, to get it approved, otherwise no-one could use it. You didn't spend a few million developing the compound, but you did spend a few hundred million testing it. Surely drug patents exist to encourage drug companies to test drugs, and bring them to market, not just to create the initial compounds.