Spiral wound carbon fiber shafts for archery cost in the neighborhood of $10-$15 fully assembled nocks, points, and vanes. Being spiral wound they have a very uniform spine. Easton even makes one that has a wood grain look. There is no special high dollar tech in making a carbon cue shaft. Heck, some of the pool shafts are still made by wrapping carbon layers and sanding smooth after. There for sure is a flex difference there. Does it matter in pool, who knows, beyond my pool shooting ability. Lot of good shooters still shoot good with a standard wood shaft where there for sure is a spine difference depending on rotation.
Carbon fiber pool shafts are not rocket science, similar construction on similar products have been out for years at very reasonable prices. While they may spend some time on the correct shaft wall thickness per outer diameter, and best ferrule and foam fill, that's nothing to justify the price asked. And yet given all of this, I still bought a Jacoby carbon shaft for myself. I really like it, was it worth what it costs, heck no but I still bought it anyway as I wanted to try it.