I've seen sellers do things like list all their auctions at $1.00 BIN and then vary the shipping charges (even within the States) according to what figure it is.

Like Hot House for $1.00 BIN, shipping is US$37.50; Bluestreak for $1.00 BIN, shipping is US$70.00.

If it weren't such a dirty trick to pull, I'd commend their ingenuity at avoiding eBay listing and final value fees.