Interesting. There are many sellers who lose lots of sales because instead of using the cheapest form of shipping available, they use the more expensive tracking with signature confirmation option. But even with signature confirmation the buyer can claim empty envelop and still get his money back.
I have a cousin who owns a brick and mortar store. When asked if she is worried about employee and customer theft, she simply answered, "it is all in the program" ie. it is the cost of doing business. I can understand you, and if I was a seller, I would feel the same way. But try to think of it more philosophically. Thefts occur in at businesses. It will at least take some of the sting away.
Many experienced ebay sellers say to add a couple of dollars extra to shipping charges and put that money in a jar. When thefts occur, to take the money from the jar to cover your loses. Just an option.
With all respect I disagree. I buy as much as I sell on ebay. I can honestly say that in over 10 years of buying I've never been screwed by a seller - not once. As a seller, I've had 6 cases opened in just the last 3 months! Things have changed dramatically at ebay recently, and it really is becoming the wild west. Your analogy doesn't work IMO because in brick and mortar, a thief who gets caught goes to jail. On ebay a thief can't get caught, gets away with it and is encouraged to continue the behavior. I think ebay/paypal really need to address this growing problem as it's unsustainable. The irony is that sellers are ebay/paypal's customers. That's where they make their money. What other business treats their customers so poorly? Airlines maybe?