I take it you've never read Upton Sinclair's The Jungle? Product safety laws are pretty new things. Apparently our society has no problem letting swords and crossbows fall into indiscriminate hands, so why is it going to stress about potions of jump that might be poisons. Caveat emptor.*
* Which comes from "A provision of Roman law which gave the seller of a http://en.wiktionary.org/wiki/househouse the legal right to keep quiet about any defects of a house which he was selling", to speak of things that put the buyer and everybody else randomly at jeopardy.
"Caveat emptor" is one thing. "Caveat omnes" is something else again. Cursed magic items have the potential to threaten not just the buyer, but a lot of other people... including the rich and powerful folks who make the laws.
But I think it's the non-cursed items that would really draw down the wrath of the powers that be. A magic shop is the fantasy equivalent of Suitcase Nukes R Us. No government would allow such armaments to be sold freely within its borders, if it was remotely within the state's power to prevent it.