This feature is just one of the many updates that we will be implementing with the Chapter 2 release. There are others in store and we will share it in another post when we finish developing it.
The store appearance will affect which patrons will come to the store. Nobles, for instance, will be reluctant to come if the store is too simplistic since "it feels so cheap" while the Lekumbas don't like when it is too gaudy. Other type of customers may be apathetic to the kind of decors players are using. Players can tweak the decors according to the type of wares they are selling to target specific patrons to maximize sales.