I won a beautiful bag last week on eBay at a very low price. I paid right away and the seller shipped very quickly...perfect transaction. When the package arrived, I noticed the cost of postage on the USPS label was $20.00 more than she charged me. This seller is relatively new with under 25 feedback, all 100%. I feel kind of bad because not only did I get this brand new bag for, probably, much less than she paid for it, but she also lost $20.00 on shipping. On the other hand, I also sell on eBay and would just quietly take the loss if I undercharged for shipping an item. Would you refund the seller the $20.00, or not, and why?