Researchers argued that Silk Road and its successors, known as cryptomarkets or darknet markets, became successful after bringing together four technologies: the bitcoin virtual currency and encrypted internet protocols such as Tor, which allowed anonymity, as well as Escrow and customer feedback systems, which gave buyers and sellers confidence in their transactions.

Source: Online market ‘is turning drug dealers from goons to geeks’ | World news | The Guardian

“In the drug cryptomarket era, having good customer service and writing skills, and a good reputation, via feedback, as a vendor or buyer may be more important than muscles and face-to-face connections.”