Imagine that only the famous smith from Blojt can manufacture/repair steel sabres. You live in a neighboring location. If you want access to them nice weapons, you have to:
1) Buy them at a very steep price.
2) Choose a promising newspawn as your future smith, give him a nice set of clothes and a heap of food, and send him to Blojt with a couple of tutors to learn the trade. Hope he comes back.
3) Mount a full scale raid to capture the famous smith from Blojt, lock him in your dungeon and make him work for his freedom. Capture his wife for more leverage if he has any.

Reality is that which when you stop believing in it does not go away. (Philip K. Dick)