What happens when the government mandates that the scarce yet valuable good is sold at an extreme loss as fast as possible? If the market were to decide how much helium cost, and not the government, a birthday balloon of helium would cost ~$200.
Surely, that is the way we are meant to use such scarce resources, right? Mandate they be sold at a 99% discount so we can empty our stockpile before 2012 and wonder why scientists can't get any?
Besides, you can probably use it to prove that coal plants emit more dangerous radiation than nuclear plants, and everyone knows that is a de facto illegal act. Just like being able to prove what the police actually did to you.