At eBay I think that's called fee avoidance. The thinking is that low minimum bid + high shipping charges = lower listing fee (and final value fee, too, maybe?).
Some customers don't mind if the overall price is still good and some will steer clear because they resent the shipping charges.
I'm pretty sure it's against eBay policy but there's no way they can stay on top of it. You might wander around the eBay forums for more input there as well.
As far as mentioning it in your listings, that's probably a sticky area. No doubt, you can make a point of clarifying your realistic shipping charges but you may be on shaky ground if you go accusing fellow eBay members right in your listings.
My two cents, anyway.