I am sure MS, like Turner before it, is making substantial profit on the pipes. It is still good power for the money and the parts companies need to make money to stay in business. For the average person paying for labor to do a one-off with stainless might cost the same or nearly as much or more, plus some of that person's time.
For $475 shipped, you can buy an entire Top Speed X-Pipe and cut the front sections off to make test pipes. This option has been available for almost a year. Band clamps cost about $10 each.
I am using the entire Top Speed X-Pipe. Back when I bought, they did not have a resonator version, so I added resonators. I think they sell one now. Delete all the cats and you gain more power (though the two primary cats are the more restrictive of the four).