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TBobwho sold me, a few years ago, 3 VG graded T206 cards on ebay and I was charged $19.99 each. When I confirmed the purchase, he told me the shipping was not a total of $6.00, but $6.00 per card for a total of $18.00. I got the same weak explanation you did and ended up preserving my feedback record by paying it. $18 postage (this didn't include insurance) for 3 frigging cards. They were sent in a plain manilla envelope.
I won't post the name, we both know who you are.