This is a much-fabricated pseudo-ad which would be a rare cherry-picked example, assuming that it existed.
In creating it you are simply trying to make a champion of the lowballer by characterizing the seller as an unscrupulous villain.
However, with such a hypothetical example the price asked would clearly NOT be fair and reasonable, and so the price you offered might then be a fair and reasonable counter offer. In other words NOT a lowball offer at all.
The reality though is that lowballers are those that simply jump on any ad that interests them, even if they are fair and reasonably priced, and then offer half as much, hoping to get something for nothing. Sometimes with the intent to repost and resell the gun for a higher price than the seller originally asked. These guys range from just annoying idiots up to opportunistic predators.
The point is that there is no reason why such offers deserve any respect or consideration. Such people are not customers and are no loss if repelled like the pirates they are.
The 98% Pistol does exist (actual asking price is $2,899). I can give you the phone number if your interested.
I have seen parts pistols just about that bad with redicilous asking prices. I admit that I may have slightly exaggerated on that one.
My point is sellers sometimes believe they have something of much greater value than most reasonable people would value it at.
On the other hand their are buyers who see a vintage $1600 Dollar (Fair market value) GI 1911 as just another old worn out pistol and don't value it at that level (and don't have a clue about a collectors market).
An example of this is my Great Grandfather's 28 ga Parker that most members of the family saw as just an old gun in an obsolete gauge so it spent 75 years in the back corner of a coat closet. A family member tried to trade it to me for an old Rem Model 11 (Browning Pat) 20 ga and wanted to know how much I would want to boot. Again this is an extreme example but I'm just saying some people are just naive and not actually trying to flip it.