Because it follows the logic of the transaction: I offer to sell, you buy, you tell me how happy you are, I tell you how nice you were.
It gets around the problem of giving positive feedback to a buyer only for them to moan like a bastard via feedback afterward.
For example: I, as seller, nearly got negative feedback because a buyer bought something from me then realised he'd bought the wrong thing and I wouldn't accept it back. Simply not my problem. I don't want to go through that hassle without having the final shot of being able to give arseholes like that negative feedback too - which I couldn't do if I'd given feedback first.
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Alan
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