“Anybody who lists an item for sale and notes “lowballs will be ignored” is potentially missing lots of opportunities to sell.”
If a buyer walks away from an ad after reading above message then what does that say about the buyer? Is he a lowballer or lacks the ability to strike a cordial communication with the seller?
From a seller point of view, I interpret this message as seller is not interested in haggling over price nor wasting his time over back n forth negotiations.
There are always ways to break the ice with someone who isn’t flexible on price. I hate to say it but most people are just plain rude in their communication to the seller. The above message doesn’t deter me from reaching out to the seller. I always start by greeting the seller and ask them politely if there is room for negotiations and state my offer price along with short explanation on my offer price. And what does my offer include i.e. who is paying for shipping and PayPal fees.