I'm wish there was a way to warn sellers! This is my 3rd listing (3 different items) that I accepted a best offer and the buyer didn't pay. Also, I won an auction and 5 business days later, no shipping, no communication! So Ebay is sending out coupons/ebay bucks incentives to try to drum up business, but then you get dead beat buyers and sellers who can't be bothered to complete the transaction. Just leads to more frustration with Ebay!
Oh and my mom did a buy it now on a keychain and the seller messaged her asking for $3.30 more in postage because she didn't calculate correctly! They ended up canceling the transaction (because why would my mom pay more than listed?) and the seller relisted with the same incorrect ($0.79) shipping. SMH!