What do you think about the possibility to open up a little shop in the garden of your house? It could be added through some exterior furniture which allows to put some items on display there and mark them for sale (although not commended, you could also link those items with the mb).

To give the personal shop a more personal touch, people could rate a shop on certain criteria like prices, rarity of the items, frequency with which the shop gets new stock and so on. Naturally the shop owner would be able to decide whether to make the ratings public or not.

I don't know... I think exploring and finding rare treasures are fundamental aspects of any rpg experience. Adding a personal shop would make the wards a bit more livelier since it gives players an incentive to go on the hunt for good deals. It would also add to the feel of districts as places where people actually live.