Definitely some good ideas.
What I would like to see:
- Implement the buy it now feature from the item search counter. If you buy it from here, you pay a flat tax on the item. One of your retainers appears, says something based on his/her personality type, hands you your purchase and heads back to their business.
- Create a dynamic, alive market wards, where retainers are organized behind stalls, moving around looking for deals (presumably looking for items for their players), or engaging another retainer in idle conversation, which you see. ("Have you seen a good deal on brass daggers? Master Demetra has been looking for one." Based on real time item searches.)
On every corner stand little puppets which you can interact with that brings up the item search counter, where you can mark the retainer you want to buy from. A blinking yellow arrow on the mini-map points you in the direction of the retainer -- remember the wards will be significantly bigger -- and when you get close enough, the star appears over their head.
Buying an item directly from a retainer's bazaar incurs either no tax or a lesser tax than buying it from the item search counter. Consider it a small reward for using the wards.