As a buyer only, I refuse to do business with sellers that won't give feedback until they've received yours. If I win a bid and the seller sends me confirmation that I've won the bid and describes how to pay for it but includes in the confirmation that feedback won't be sent until I send feedback for them, I cross that seller off of my acceptable seller list and never do business with them again
After winning a bid, I either pay immediately with paypal or I send a USPS money order the same day if the seller doesn't accept paypal (provided I have their address). When the seller receives my payment (either immediately by paypal, or within a couple of days with the money order) they should issue positive feedback since I have fulfilled my obligation to them for fast trouble free payment.
If the seller should send me an item that is not what they described in their listing, or they take an inordinate amount of time to get it into the mail, then they deserve to have negative feedback against them.
BTW, my feedback is still at 100% and I've only once issued a neutral feedback against a seller for taking 11 days to send out an item that I had won.
Be Yourself, Everyone Else Is Taken!