Also, I want to add gossip as a feature. Temporary raising your shop marketing value - or reducing someone elses. There needs to be more interaction between the shops. Maybe even a little sabotage and theft.
One thing related to that I would like to see is being able to trade between shops. Maybe it turns out I bought too much leather armor so I sell it at a discount to another shop. Conversely perhaps a shop is in need of swords so I sell them one. Or perhaps I just need a little more gold to buy another section to my shop so I sell some goods to another shop.
As well, it would be very appreciated if the page that lists shop section pages got merged with page to buy shop sections.