What is "low ball"

Lowball is in the mind of the seller.
If the seller thinks the offer which is below his or her asking price is a lowball offer, than it is such.
I would say any offer below the asking price in an ad mentioning no lowball is going to be considered a lowball offer.
The closest to making a less money deal with such an ad would be to ask for free shipping. Even that would be an insult to many with such a blurb in the ad.
So Lowball is anything less than the asking price to the seller mentioning the phrase.

As for the potential buyer.. Why bother even making any sort of offer under asking price, to a seller with such an ad?
It is clearly a waste of time.
So in that sense, anyone who WOULD make an offer below asking price to a seller stating no lowball offers, is just being annoying, and thus deserves the title of 'bottom feeder'.

Lowballers=bottom feeders? I don't think so. It's the buyers who set the sales price not the sellers. I have been tracking sales prices on certain items and it is the sellers who are continuously trying to jack the prices up. So, if your price is too high and a buyer offers the going price, is the buyer a lowballer? I don't think so.

I agree with Rrog. The sellers who always crack me up are the ones who list a price and then also say "or best offer", and then complain and label as "low-balling" any offer they actually receive below their asking price. "Or best offer" clearly implies a lower offer. If you don't want to accept an offer below your asking price, don't imply that you will. If you list "or best offer" at all, you will get some low offers, period. You don't have to accept them, but you don't have to ridicule them either - you asked for them.

I have offered less many times on items listed with "no low ballers" or similar stated in the ad. CLOSED MANY, MANY DEALS!

I ignore such statements. It is used to make people think that the item is somehow exceptional and the seller is not willing to negotiate.

The fact that they are willing to pay to list and write the ad and maybe take pictures clearly sends a different message. "The item is no longer wanted and needs a new home." Anyone willing to go to that much effort would be a FOOL to not consider accepting money from a willing buyer.

Times are tough in a lot of places and this is a discretionary purchase. Certainly not a requirement by any measure. I guess it makes the seller feel better when they ad such verbiage to their ad. Like I said I either want the item or not and I have a price in mind. We either come to a professional, cordial and upfront deal or not. No Biggie!

New items show up every day and there are only so many of us that have the $$, the time and the inclination to buy. I agree with Rrog, the people with the money and the desire to buy are the market and set the price. Sellers can put whatever they want in their ad copy. I can choose to ignor it. Freedom of speech man!

Anything where the price is marked 'firm'. I always mark my price 'soft' with no 'low ball' or 'bottom feeders' welcome. Always get the price I think is 'fair', whatever that means.