My experience with PA is limited, but I believe this particular "crazy law" is a strictly enforced one. Recently, a friend and I took a drive to Monticello, NY, to check out the local gambling situation (my friend is a gambler; I'm not, but I like driving around NY State and had never been to Monticello). Somehow or other, we ended up in Port Jervis and crossed the Delaware River into Matamoros (a pretty enough town with no marijuana-trafficking devil-worshippers in sight), which had several stores blatantly advertising the sale of fireworks. My friend used to throw a big July 4 bash at his house, and was known to drive 4 or 5 hours to Harrisburg, PA, where he spent up to $1,000 on fireworks (which would all be spectacularly exploded within a 20-minute period during his party). We checked out one of the stores. From what I remember, the proprietor did say that PA residents weren't allowed to buy the fireworks being sold in PA. In addition, he said that fireworks were illegal in NJ and NY, and that the local police often staked out a spot near the store, followed paying customers back into their respective states, arrested them, and confiscated their explosives before they ever had any chance of expoding them. I said, "And you still manage to stay in business?" He smiled and replied, "We're makin' a killin'."

Then why not stop selling fireworks in PA, altogether? I doubt the majority of potential customers are from out-of-state.