Crazy thing is you can find a lot of amazing ring grain in factory pipes, and a lot of smooth factory pipes with Plateau that would undoubtedly provide good ring grain but they're still sold as budget smooth pipes instead.Sandblasting or rustication are what pipe makers do with less than perfect stummels.
If they start off making a smooth and discover flaws, blasting or rustication will disguise those flaws and make it saleable without the need of filling in the defects.
Very, very occasionally a maker will see a "perfect" piece and go "wow, this will result in a great ring grain" and blast it. If it happens, expect to pay as much or more than one of his smooth pieces.
The price for any given finish can be highly variable depending on the country and target market.