So you put goods out for sale with the goal of someone paying you your asking price, or near to it, someone does, seemingly regularly, and this is a problem? Hmmmmm.... I'm not sure I follow the logic here.
If I sold someone a comic, or anything else for that matter, and they paid my price, gave me the money and proceeded to light it on fire right in front of me, it really wouldn't bother me one bit. My goal has already been reached.
Also, would it not be the people spending the 10$ each for the raffle you should take issue with? I can ask 10$ for a used Kleenex if I wan to on eBay, but someone has to pay the 10....