Yeah i guess you are right, selling 4 instead of 2 also sounds like a much worse deal to me.
You probably didnt get more for it, so money wise you it may not be a better deal, but you ended up selling more cards to one buyer, so to me if thats not a bigger/better deal i dont know what is.
Well if you really wanted to make the deal work you would have at least send one pm asking me that you didnt get a payment and would be cancelling the deal if not paid within ... hrs. But since you knew you had the bigger deal in place with the other buyer you were all to eager to jump on it and cancel the deal without sending me a message first.
The feedback is not retaliatory, you didnt even allow 24hrs for payment and didnt send one message before cancelling the deal. Thats not the way an honest trade works, and not how the rules work that you pointed out yourself to begin with. To me it warrants to negative feedback, because a late payment wasnt the reason for cancelling the deal, a bigger new deal that you had in place was the reason for cancelling the deal. Im not a complete newbie with card trading/buying/selling so i know when im getting duped on a deal.
But hey in the end you are always right! Good luck with the bigger deal, hope that worked out better for you!
Thanks!