Kybassser, no offence meant towards your Father, just giving my observations as a customer in line. I do a good amount of shipping with my ebay things, and the PO has killed us with the rate increases on Priority mail, especially the flat rate international. One example was the Flat rate envelope, used to have a large and small envelope, that were $5 and $6 international to any country. They eliminated the small size, and increased the large one to $11.95, and did similar increases to priority boxes. Now it is are nearly .50 for a 1st class letter. Yet, I get a fist full of junk mailed all folded together, and it tears my wife's magazines stuffing it all in my mailbox. I should not have to put up with damaged magazines we want and pay for, in order to make room for crap I throw out. You should have the option to tell the postman refuse delivery, on junk mail. If they rip and tear you magazines in the process, they should pay for them.
In case you did not know it, flat rate mail is great, but if they can not deliver it for some reason (international), they have the option to discard it. I do not think flat rate is insurable, because they would have to pay lost mail claims if it was by discarding deliverable parcels. On regular international mail parcels, the customs form you must agree to pay for the return shipping, or check the box to discard non-deliverable mail. One digit wrong on an address and it can not be delivered, could cost you $100 in postage, or maybe hundreds in the price of the item. Ebay will make you give a total refund to a buyer if they do not receive it, while the post office has a loophole to discard shipment.