One thing I did notice with your sales is that you tend to sell mutiple items to a buyer. They purchase 4 or 5 items at a time, paying for it all at once. Thats great, but because 5 items are purchased in essentially one transaction, the feedback only counts as 1 feedback, even though there are several items. It is feedback per transaction, not per item when more than 1 item purchased. Now, there are some who may not have left feedback yet, but the above does account for some of the discrepancy.
Rick
"Egotism is the anesthetic that dulls the pain of stupidity" - Frank Leahy