Here I use chocolate as well as a direct, factual reference as in a metaphorical way… opening a shop (as any other business) is a display of faith on an idea, in this case a quite public one. Whoever has a blog will easily understand: you have an idea that you prepare, polish and then make public. Then, for reasons you never quite understand, some ideas you thought were not as bright get most of the traffic (or at least that is what wordpress stats say…) while others, brighter at first sight, lag behind. In a blog, the effects of this are usually limited, but in a shop they can mean a difference between earning or loosing substantial money. Sure, mere footfall does not translate into money, but it is usually a precondition to make a product known, and, eventually, to sell something…
The external presence of a shop is essential. A clean, tidy, well-lit showcase is a minimum requirement, but you also need it to be located in a busy place, which implies a cost. To optimize this cost, you have to make attractive as well the premises as the product. Somehow, you have more chances to configure your shop than your product, especially if you are not the maker. Anyway, you have to be different from competitors.
Sure, shopkeepers want to get clients to see their business; what we get as a collateral effect is a care in the display of some things that configure public space, an aesthetic quality that is sometimes noteworthy. You can sure direct the debate towards consumerism, but it would be missing relevant elements in this situation.