I agree with you Stu, I have felt like this when making purchases on e-bay. Like you say, once payment has been made my side of the deal is complete, and I'd hope the seller would recognise that. I frequently get e-mails from sellers saying 'hope you like the item, please leave positive feedback and I'll do the same for you'. It's quite frustrating and I don't respond. I'll leave positive feedback once the seller has left feedback for me. Maybe that is petty.