The existence of darknet marketplaces for items illegal to posses or trade proves the existence of a supply and demand for the product. Despite enormous risks, ease of production and widespread demand for these products have resulted in non-sanctioned markets for them. Even in the absence of Silk Road, other markets are arising to meet the needs of consumers and producers.
Darknet markets are prime examples of how a free market systems work, which produce safer, more affordable, and higher quality goods despite risks. I'm simply saying that the market, uh, finds a way.