I've had quite a few sellers tell me the same thing. I don't sell that much stuff but I believe that as a seller it's my responsibilty to leave feedback first. When I do buy on Ebay I will never leave feedback on a seller before they leave feedback on me. I believe the seller should post about the payment and that the buyer should post about the item, in that order. I missed quite a few feedbacks due to this, but life goes on.

Victor