We live in the age of capitalism, which means that with a lot of hard work and a little bit of luck, the business world is your oyster.
There's a market for everything these days, so no matter what you're trying to sell, somebody somewhere will buy it.
But just because you can sell something doesn't necessarily mean that you should. A lot of items out there are one use only and should be kept that way. Still, fear certainly didn't stop these folks from trying to sell the most obscene items they possibly could.