In our world, quite a lot of our early trade was about food. It was profitable to send out multiple ships and loose most of them with most of their crews, to bring back a ship full of black pepper. In Dragaera, spices can be easily carried via sorcery, while big stuff might be better off with traditional ttransport. We have thousands of varieties of wine and cheese that have been developed in various local regions. But despite these, isolated villages have long traditions of having little variety in their food choices. Some things grow better locally. I wonder how much problems Dragaerans have with drunkenness and drugs. It is interesting to read about how gin and sloe gin took over England for a generation or two. One thing that contributes to societies' unwillingness to have legal drugs happened when servants and employees started driving the rich around. Certainly you don't want someone teleportating you around without his full facilities.