I have been selling Jeweled Onyx Panthers, but not the lesser ones. As far as I'm concerned, it is a no risk proposition because I intend to learn one myself eventually so if it never sells all I lost was the opportunity to ride it a little sooner. The few that I have sold have netted me a solid profit, crafted for about 80k and selling for well over 100k. They certainly don't sell fast and I could probably get similar returns just selling the gems and living steel, but I still think its worth trying if you plan to learn it eventually but haven't yet.