Did the Shader guru comment get under your skin or something?
No, I dont feel touched by this comment. I can even agree with you. There are such people as you mentioned.
And I just checked and did not find a MotionBilder license at Ebay. And I think it is easy to find out whether Autodesk allows to transfer a license though I cannot imagine that somebody who bought it for more than 5 grands will give it away for cheap at Ebay.
You can contact me if you find such a cheap offer! I have no problem to get a nice animation tool for cheap. I just cannot imagine that this is possible.