Say someone is buying or selling something. You send the money and sellers run away. Well that sucks. After that it's his word vs her words. So you choose not to do business at all. A lot of good business opportunities are gone. I wonder if there is a bhw service where a very trusted members, say mods, can be a witness (with payment). Details of the deal can be hidden from public (adsense id, etc.). So before you do the buying and selling, you forward the data to the witnesses. The data must be sufficient so witnesses can figure out who's lying. Things like actual username, etc. If things go wrong the witness can tell who is lying. Witness can collect $20-$100 depending on amount of transaction. Must be very credible. What do you think? Just an idea. When people can trust each other more there will be more trade in bhw. It worths that extra $20-$100.