"Rabid Koala sez:

I am one of those evil sellers that will leave a positive only after the period of time I have allowed for returns has passed, or I have received a positive from the buyer. I do send a note that their item has been shipped and would they please let me know that it has arrived safely by leaving a positive."

I have bought a lot of bike stuff off of Ebay. I only buy from sellers who leave feedback right after being paid. As a buyer, as soon as I have paid, and the money is with the seller, I have discharged all of my obligations in the transaction. Sellers who wait for feedback before leaving theirs, or even worse beg for positives, get nothing from me, including any future business.

A seller who waits to give feedback is simply holding the threat of revenge feedback unjustly over the buyer.

The only positive about transacting with such a seller, or sellers who do not ship outside of the US, is that their auctions are typically heavily discounted relative to others.