I don't know what the seller paid for postage, and sellers don't have to charge exactly that amount. They can charge a bit more or even less. Insurance is the seller's responsibility, not the buyer's, as it protects the seller if the item gets lost. Did the seller charge you for insurance? If he did, then he took advantage of you plus he broke eBay rules. Still, why insure a $50 item. The Signature Confirmation, again, protects the seller, but why would he get/you expect SigConf for a $50 item when all PP/eBay requires for transactions of $250 or less is Delivery Confirmation? In any case, you can see how much he paid on the label, right? Say he paid $10 and charged you $15. IMO, the extra $5 wouldn't be much of an issue unless it was meant to pay for services he did not buy.