Some buyers just throw a low offer out there to see if it'll pan out because sometimes it does and its just what they do. Some are ignorant to the process. Some are just playing games. If the offer is ridiculously off the mark I just ignore because I'd rather not deal with folks in any of those categories...it rarely works out.
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.