I should have said the above (9%) is for "auction style" listings. BIN listings are category specific with the highest being 13% for books, dvd's, cd's, video, etc., the lowest being 7% for electronics, along with the .50 listing charge and paypal's 2.9% + .30 per transaction for domestic sales.
For paleopilot-
I used to do what cyberdan does with shipping. Now I always add a little extra on my shipping prices and I charge a flat rate fee no matter where you live in the US. I don't use the calculator based on location because it doesn't allow for the extras (ebay fee%, materials) without adding the extra "false" weight to it like Dan does. I figure out the highest shipping price based on the boxed weight and postal zone and go from there. I haven't had a complaint yet. As Ben said, the total "out-the-door" price of the item is what it boils down to. Bidders/buyers will always take that into consideration. With minimal effort, I still have my 5 star rating and "top rated plus" seller status.