Also adding a Bazaar NPC to your home would be potential danger to the possibilities of socializing! The closest I would come to this is to request they add an Auction House in the Arcanum somewhere.
Recently with the castle tours they added a crafting recipe for a Babbage Basset (the castle magic shopkeeper) that can be crafted with event rewards, For a long time I wanted a way to get Elik Silverfist in my house. I picture the recipe for crafting Elik Silverfist, to only be sold by a faction vendor located in the bazaar, the badges associated with the faction would be "sell X gold worth of items at the bazaar" and "Buy X gold worth of items at the bazaar". However, I wouldn't just have a Elik silverfist Crafting recipe. I would personally have it so each category of the bazaar would have to be crafted as a separate merchant. so you would have a craft able "Equipment Auctioneer", "Housing Auctioneer", "Treasure Card Auctioneer", and "Hobby Card Auctioneer". As for the crafting recipes, they shouldn't be easy to make, but they shouldn't be inaccessible to newer players either as how essential the bazaar is in day-to-day life. If they added something like this it would make my day, I'd be fine with just a craftable Elik. But I think having different merchants would be grand.