Please all buyers and sellers DONT have to be asked to leave feedback, its not ON
when a payment is made very quickly please send them a feedback, dont wait till you see what feedback has been left for you before leaving theirs, its bad manners.
And buyers as soon as you recieve the goods and all is in order leave your feedback for them. it lets the seller know you have received the goods pronto, and in good condition.
sellers dont wait weeks to leave feedback, its not good practice, you didnt get to those big numbers by people not leaving you feedback.