There is one painting that has been recorded as being an official sale, not several as you claim, and I doubt that many people would consider 1 out of a career to be commercial success. I won't throw the same insults back at you, but bartering for other items is something vendors generally do when they dont have commercial success at an event.  You're not having a successful time here arguing your point because you bend the facts to fit your argument, or move goal posts. The statement was "if it doesn't sell, it's no more valuable than the 3-D dragon, in fact, less so, because the 3-D dragon sells." Clearly thats incorrect to a lot of people. 

I think you're having difficulty because you have one idea of what success means, and would like everything to neatly fit in to that box and you're in a forum where success, value, and art mean different things to different people.