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I was hoping to propose a means by which a shopkeeper could be provided a list of who purchased his or her goods since the last time he or she stocked the shop.
This could be done in a couple of ways. One, every shop could be automatically provided these means, or two, it could be sold as a (preferably cheap) artefact in Artefacts Misc. similar to the tradebooks.
I think a caveat should definitely be provided by which the buyer may opt to remain anonymous in purchasing from a shop, probably by slightly changing the purchasing command. ("buy vial397432 anonymously" or some such.)
The benefit of this would be to enable buyer/seller RP within the shop as through person-to-person. In some real-life cultures, excellent customer service is highly sought and expected. A merchant might choose to send buyers, (especially frequent buyers,) well-designed thank you notes, or provide them with a frequent-buyer discount. For more mundane but still highly useful purposes, knowing the groups or individuals that especially tend to frequent a particular shopkeep's shop will enable that shopkeep to design more content that group or individual likes, especially since knowing who is buying can simply be contacted to ask about their tastes and preferences.