I read this blog on a regular basis, and it's typically good advice.
Then I read this entry... now, I sell a buttload of stuff on ebay, so while I agreed with almost all of his points... he made one that I totally have to call him on.
International bidders account for at least 30% of my sales, I've never had a problem yet. Yeah it's a minor hassle when dealing with customs paperwork, but Ebay/PayPal makes that really easy too.
(ironically, I have had a few problems when making my own international bids, but never selling, yet...)