There's a reason rusticated pipes are cheaper. As soon as I see one, my first thoughts are either the briar was flawed, had very poor grain (cheaper cut), or the carver is too inexperienced/unskilled to read the grain of his block. A sandblast finish is more forgiving than a smooth, still allowing you to see the natural beauty of the grain, yet hiding some minimal flaws/pitting. A well made smooth pipe with consistent proper grain flow is just a work of art.
I would venture to say rusticated pipes are low-end raw material, or low-end carving. Well made, good looking rusticated pipes usually being the former. (that's why they're "cheap", they have their place, I have some too!)