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'.

Every item I bought here I bought at the asking price. Every item I have sold, I have sold at my asking price.
I ignore sellers asking crazy prices. Why bother?
When I see somethng I want at a reasonable price, I want it. I do not need to 'get' a better deal.
Simple.
If others want to plan on dickering, and set an unrealistic price, fine. No problem. I did not have to buy thier item.

Some of all this is playing games. Buying and selling to buy and sell, and NOT to aquire equipment one really wants.
As far as I am concerned, way too many resellers. Folks just wheeling and dealing. The actual plain old Audiophile selling an item they used for a bunch of years, wanting to see it go to someone who can enjoy it as much as they had... getting rarer.

What is "low ball"? Answer: this thread.

My offer: I will take your MBL 101E off your hands if you pay me $2,000. and deliver them to my door. Oh, I expect a five year warranty too.
ROFLMAO