2) The 'damage' is not the result of rescinding from the 'trade'. It is the result of sharing information which everyone should have access too.
Damn right. Quicksy would probably try to call it an "implied contract" of keeping quiet but he's also said in the past that PMs are not private. If you ever get a flag for this I'll oppose it.
The only reason why he received the information in the first place is because he entered into an agreement.
If I see a bicycle you're selling and tell everyone that it's ugly and the chain is broken - I don't think I'm in breach of a contract. Regardless of whether I subsequently buy the bicycle or not. Regardless of whether I mentioned a dollar amount beforehand or not.
Well done though - such valiant selfless defence of account farmers.
Perhaps you should stop commenting if you don't know what you are talking about -- I get that you want to make use of that paid avatar, but these types of posts are very harmful.
None of what you said has anything to do with the specific fact set that results in the OP being in breach of contract with the seller he was dealing with.