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Eric BRobert, the transaction is not over when the buyer pays. It's over when the buyer receives the goods and signifies that he is satisfied. At that point feedback should be left, by either party.
The easiest way is for the buyer to just leave it first so the seller knows it has been received and the buyer is happy and the seller can then reciprocate w/o fear of retaliation. It's simpler than the buyer emailing the seller, say he received the goods and is satisfied, ask for feedback, then leave his own.
It would be foolish for the seller to leave it first....just look at the dozens of examples why.