Aren't there any laws against owning, trading, and using dark magic objects? In the real world, there are laws against private citizens owning hardcore drugs, anthrax, surface-to-air missiles, and other dangerous objects. I couldn't imagine the government allowing a shop to openly buy and sell illegal objects and substances. Wouldn't the Ministry of Magic send some police over to Borgin & Burke to shut down the place, confiscate illegal items, and fine the owners?
Community content is available under CC-BY-SA unless otherwise noted.