One thing missing from the classifieds forum is the ability to ignore users, something that is a function on Sailing Anarchy - although there are more wingnuts and a lower tolerance level over there.
I would have found this quite helpful for sifting out the users in Classifieds I don't want to buy from, either because they constantly relist the same stuff at silly prices (ie, Mr Evil Sovereign seller) or haven't proven totally trustworthy in the past.
That said, this isn't as much of a problem as the people on eBay who jam as many brands or part names as they can into a listing so it shows up on searches for other stuff.
As said above, I try to post pics with a listing, and have sent stuff to people for free quite happily in the past, too. People should be free to post as much stuff at silly prices as they like up in the Classifieds, but we should also be free to ignore them.