Exposure? You cannot buy a watch like that for $500. The person who bought it (or any others like this) fall into one of three categories.
1. A moron.
2. Someone trying to take advantage of an unsuspecting seller.
3. An uneducated buyer.
If it's number one nobody can help them because you can't fix stupid. If you did this time it would only delay the inevitable which is tommorrow morning.
If it's number two then they got burned at their own game.
If it's number three well they pretty much roll with number 1. Everyone needs to take responsibility and do their own homework. If they won't then holding their hand will only produce the same result as Mr. Inevitable probably visits them alot as well.