Hello,
Exactly the same suggestion was also given by me a month back in this matter. In last month of September, out 16 sales only one buyer left feedback, whereas each & everyone were satisfied with transactions. This is a fact, buyer, specially new, do not study the importance of Feedback as it does not matter to them whereas it is most important criterion for a seller in all respect.
I strongly suggest, if a buyer do not leave feedback, it should be presumed that he has no problem in transaction, and Ebay system should give auto Positive Feedback to seller. Sellers should not be under exposed due to negligency of buyers.
Thanks,
Ashok Agarwala