Teleportation as routine appears to be recent. Roads still exist, and peasants still stay local (with their wagons going to near by markets?). We don't see it being used to carry a handful of apples to a market in the other side of the empire where prices are good. Teleportation would be useful in mining. We have seen places where people don't teleport too closely for various reasons. The people we have seen trading overseas are the Orca - who use ships for this trade. Ships are useful for heavy loads, but if teleportation was widely available outside the empire, there would be some kinds of infrastructure for buying and selling small items that the traders got from the other side of the world a few minutes ago. It is true that Dragaerans are conservative, and that times are changing quite rapidly as far as sorcery is concerned. But money is money, and if such trade was easy, we would see lots of signs of it. In our world, a great deal of world exploration was for spices. Magellan took 3 ships on his trip around the world. He died, two ships were sunk, but one ship made it with a load full of black pepper. The investors were richly rewarded by this fantastically successful return. Trade in small things, that can be carried by someone teleporting can be quite profitable. Conclusion: Teleportation is not as common as we see, and much more difficult around the world than we might guess.