As long as the auction states or hints to the fact that it is home made, or if he at least offers a refund, I would leave him be, really. You really don't know how badly the Bank of England, the Federal Reserve, and these giant Coporations are playing you, and all of the rest of us.
Ignore there propaganda, they are NOT loosing profits, listen to the experts from the Universities, not some lame rep from within there own company. The system is designed to give the people as little money as possible, and horde all the rest, why do you think we all keep going into recession?!!? It is NO mistake that the people no longer print and control there own money, you are being screwed!!!
Anyhow, if you do have a valid complaint beyond ruining this guy's (most likely) low income desparate life, and do not believe in Free Trade (which has been dead for years), then check Ebay HELP and do a search for what ever it is he did.
Sent you an item that was not described and refused a refund, broken item, non-paying, ignoring E-mail, etc.
Good luck!
Otherwise just do your search in Ebay's HELP, for what ever it is that the guy did to you. Refused refund, etc.