I've just sold a couple of things on ebay for the first time. Both my buyers paid almost immediately. My question is - should I leave feedback now, or when I know they've received the items? I sent the items by 'signed for' and I know one of them has been delivered. Or should I wait until they give me feedback (though conscious they may not as of course it's optional)? I suppose what I'm saying is I don't want to give positive feedback and get nothing in return. Am I being naive here (please just say so if I am!!!)?