You mean like a marketplace where you set up a shop? That would involve ta-

"but you dont get taxes so its fair"

We already have auctioning which involves taxes. Taxes are part of markets. Besides, you already said "players need to buy a deed or something" so you would be paying for it anyway. Would the deed be a permanent ownership, going against the whole part of the game where us knights are just taking refuge in Haven under the Strangers, or would it be a rental deal where you have to pay over time and some of your profits?

Auction satisfies almost everything we could ask in a public market without having to sit around waiting for people to come by or worrying about leaving your store overnight and having someone give you a better offer only to find it bought already. You could say auction still has anonymity and you might want something other than crowns, so this.