I'm not really this deep in the dirt but I follow up with the communities and the biggest I problem I see here is how the vendors have WAAY to much power. They can over price, they can scam, they can pretty much do whatever they want. In this day and era you would expect there to be a more advanced market by now which can provide a trustless peer to peer transaction. Are any of these in the making? Is it even possible for such a market to exist? The buyers should have the strongest voice, the buyers are what keeps these markets alive...
Openbazaar
Decentralized marketplace pretty neat actually you'll find normal things there as well such as comics,books etc