Not just pre-prepared supplies. I remember a story from Katrina, some guy trucked a half-dozen generators in from out West and tried to sell them at inflated prices, was arrested for gouging and the generators were held as evidence and never used in the emergency. If you allow more people to try to do this, you effectively increase supply and limit how high prices can rise. But if you restrict it, people have to go without... Or those who are above the law and flout the restrictions profit even more.