I'm a big proponent of the "Getting to Yes" type of negotiation, where both parties try to find a fair value for the item. So if you come in with a lowball offer that's clearly just meant to be a lowball offer, I'm more likely not to bother talking with you further -- because it's clear that our initial valuations are too far apart, and I don't really like someone standing there giving me some tap dance show.
That doesn't mean that I won't haggle -- just that this "I give you an unreasonably high price, you give me an unreasonably low price, and we split the difference" approach to negotiation just doesn't make a whole lot of sense. The fair price is rarely right in the middle of two unreasonable offers, and it's silly to sit there arguing about whose unreasonable offer is going to "win." Just talk about what the item is worth, then agree on that price.