WoodPeckers seems to be selling a number of these "one time" tools. I suspect, but can't say for sure, that it is an excellent way to keep the machines and workers busy without creating costly surplus inventory. Most of these products are made from solid billets of aluminum, maybe surplus from other products, and CNC machined. That machinery isn't cheap either so needs to be kept busy to pay for itself. By having pre-orders you have a known, limited quantity to make and can be squeezed between runs of parts for the main product line. It is a relatively safe way to evaluate product demand, too. If it turns out to be a popular item, it is easy to reload the program, mount the fixture, and cut a bunch more on the CNC. Pretty smart business practice.