I agree totally with Paul MacIntosh's post. I don't expect to get paid for packaging up a plane for shipping, and I don't like having to pay for "handling". Just the actual shipping costs. But that's just how I see it.
Regarding demanding more money for shipping, that's too bad. If I say $5.00 for shipping in the ad, and when I get down to the P.O. they say $10.00, then the difference is on me. I should have checked beforehand. And I won't buy if I can't get a fixed shipping price from the seller. None of that "buyer pays all shipping costs" for me. I will e-mail and ask what those costs are, and not buy if I can't get a straight answer.
opinions will vary, jk