Read my previous post....for the purposes of the OP's question the discounts are paid for by ebay.....the seller still gets paid the full amount of the invoice.

In the end I have no doubt that the seller pays it from their fees but they do not just get 80% of the invoice total in the payment for the item.

Are you saying that the stores that are in the 20% discount promotion advertised by ebay are NOT being paid the full invoice amount but are instead only getting 80% of the amount?

That is news to me and I am sure to many others.   I have used the discount code for several items that I have picked up in the store and my invoice shows that the seller has received the full amount, not the discounted amount that I have paid.