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.
The OP would not have received said information if he had not agreed to buy the forum accounts after receiving the PM.
It is good to know you will oppose holding someone accountable for not honoring their terms of an agreement, and that you will protect someone who lied in order to get something from someone.