Problem is many sellers inflate their price somewhat expecting that they will receive low offers and their prices will give them room to negotiate a fair price, so what exactly is a low ball offer. Earlier in this post a few mentioned 30%, certainly a low offer, but consider if a seller inflates his price by 15% expecting a buyer to ask for a 15% discount, as they routinely do, a minus 30% offer could in fact lead to a successful conclusion at a fair price. I'm far less concerned with the amount of the offer than the manner in which it is conveyed.
Does it make sense to "ignore low ball offers"?
Assuming the person wants to sell the item and is accepting offers (since he didn’t say the "price is firm") then why say "I will gladly ignore low ball offers" ?
Why not make a counteroffer to the low ball offer? Thats how cars, houses and most anything that doesn’t have a "firm" price is purchased.
If its because the seller doesn’t want to waste their time negotiating they should say so or simply grow-up a little bit and not get so easily offended by a low offer. Besides, a buyer has no idea what the seller is willing to accept unless you negotiate it.
I’ve sold and purchased a number items after negotiating from a low first offer.