Well a lot of users, can easily be fooled by another claiming a domain, that isn't even there's.
So to prevent this from happening, I've came up with a new rules to help everybody. If your selling a domain you'll need to upload a txt file into your site.
Stating that the site is yours, and you have the right to sell it. Example.
Inside the text It, should say. Approved Sale by Panic(Actually your username) on WebmasterForums.
Those who dont abid by this rule, your thread will be closed until ownership proved.