Interesting datum:
I was recently looking on THAT Auction Site (non-train items) and ran across two Buy It Now auctions (yeah, I know: contradiction in terms) for the same product.
One had a BIN price of $70 with S&H of $72; the other had a BIN price of $146 w/ FREE Shipping.
Ahem.
Paying the HIGH shipping amount actually saves the buyer $4.
I don't know who's laughing louder, Ben Franklin or P. T. Barnum.