There are some really great buyers out there in Ebay-land. I recently sold a large lot to a collector of mint sheets and plate blocks. I did not get any feedback on the deal which seems to be fairly common. Two weeks later I received a a handwritten ( yes handwritten not computer typed) from the buyer thanking me for the great selection of stamps he received. In this day and age this really made my day that a collector would actually take time out of a busy day and send a letter. Keep the faith as there is a lot of good out there !!