It's a wonder sellers don't get more negative FB from buyers because of the barrage of emails that eBay sends to them.
I just made multiple purchases from a seller over 2 or 3 days and felt hounded by eBay for payment. I wish they would let the sellers handle their own communications so we get rated for our communication and not eBay's. Many customers believe those emails come from the seller and probably get just as annoyed with them as I did.
I agree...DO NOT DEMAND FEEDBACK. Recently I bought a couple of items from the same buyer at the same time. I paid my bill ASAP. Then I got an email from the seller asking me to leave positive feedback if I expected the same in return.
I've already done my part by paying. I am not obligated to leave feedback. I love to give credit where credit is due.
To make a long story short...I left positive FB in disrespectful vain.