Ok, so this is mostly aimed at Merchant Guild, and the item crafting guilds: Smithing Guild, Alchemy Guild and Tavernkeeping(Cooking/Brewing) Guild.
I think it would be good it iron out a few things. The Merchant Guild has been doing great work with NPC customers which can trade gold or exotic items for crafted items. I was selling my snacks there, but with the Tavernkeeping Guild not having clear item crafting rules right now, I decided to wait. However the Alchemy and Smithing Guilds are as I understand it, about crafting metalwork and potions, and if players can sell those items that would be good.
Anybody, any player should be able to make a potion, or a sword or armor, etc. With the leader and member of those specific guilds defining the game mechanics to create the items and DM them.
What the merchant guild can do is continue what they have been, in the main thread now. In the Merchant Guild thread they have allowed people to set up a shop for other players---or NPCs---to buy and haggle. These kind of mundane RP stuff is good fodder for the main thread. That way the Merchant Guild thread can primarily focus on tweaking the rules of NPCs.
Even if the trading stays in the Merchant Guild thread, it would be good for the crafting guilds to "iron out" the rules for crafting and start allowing players to do so, so they can set up shops. It would be good if the leaders of the crafting guilds lead by example, craft and sell a few items please.