Just remember that it's not pure carbon fiber. It's a composite of carbon and plastic. AT uses it on their least-expensive cartridges because it's durable and less likely to be bent or broken accidentally by rough handling or an inexperienced user. If it sounded better than an aluminum tube, AT would be using it on more than just their entry-level cartridges.
The issue here is that the words "carbon" and "carbon fiber" sound sophisticated, advanced, high-tech... and let's face it, audiophiles and hifi enthusiasts are drawn to things like that. LPGear is taking advantage of that and profiting from it. Capitalism at its best (or at its worst, depending on your viewpoint).