I've been a member on eBay since 2004 and in both Santa Monica and Santa Cruz the post office was just a hop, jump, skip away. "Extra" trip was just a few blocks for me. Not trying to be cocky, trying to state a fact as to "why" my ranking is at 100%.
I did have a guy in England who attempted to give me a bad rating through Paypal, etc., but I worked it out with him. Guy wouldn't give me his exact address so I knew it was shady from the start, but he had won the item.
I knew a guy who had a 100% rating on 5000 items sold. That's just crazy good seller. I have sold less than 100 items and bought over 100 items off eBay. The items I've sold quite a variety. From original fencing T-shirts, camera gear, film equipment, to books, and at that time I did ship world wide. My Nikon camera body went to one part of the world and the lens at another.
Because I'm a writer I know how to market the item. My eBay description very detailed on every dent, scratch or imperfection down to the letter. No surprises. On most items I offer 100% back return, but not all. It's a combination of my shipping offer, truthful descriptions and quick turn around communication that I've not had problems on eBay. Those are just facts.
I no longer sell on eBay because I don't have large inventory. I'm back to Craigs or smaller forums to get a little bit more for my money now.