Purchase of wheels and tires from another member gone bad

This a very unfortunate event to happen on this or any other forum. I haven't had many transactions but those that I were involved with went very smoothly so hopefully this won't deter others from buying and selling on FABO. I don't know if this a plausible solution but anyway here goes: for purchases greater than say $100 or $150 maybe some kind of contract can be made and put on record on this site. I know this will involve other people's time, effort and watch but then sellers and buyers are documented. $700 is a lot of money. We all hate to eat even 70 bucks financially and on principle but hundreds of dollars is a killer.