As a prolific seller across a number of platforms for decades, lowball and BS offers are just a waste of time. If they are close, make a counter offer, but in my case I delete or ignore lowball BS, scammers, etc. If you are selling one item and rarely sell it's not an issue, but when you have multiple items listed and you have an endless stream of idiots sending lowball offers it's just not worth the time as these are NOT your buyers.
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.