I gave a 10% Paypal discount to a buyer last week. I'd offered it to encourage them to buy lots of items (they bought about 25). I gave them the discount through Paypal as the ebay systems won't allow it. So I even paid ebay fees on that 10% even though I didn't get the money.
I used ebay shipping, sent the items priority mail. They were delivered already.
Now ebay has ALL these items marked in my Print Labels & Ship section.
If I get dinged for 25 items being late I could lose my top rated status.