Sadly, I think we are going to see more of this. People who have not done their homework, or any research on an item, and expect absurd eBay prices. Thing is, in a case like that, all it takes is a couple of cold, dry facts to burst someone's bubble.
Perhaps they saw a pristine Apple IIc Plus sell for $500. It's the same thing.... right? (Fact: No)
I don't believe I have really heard the term "ad stomping" before. Had to search for that a bit.
"Ad stomping" is the act of posting disparaging or derogatory comments or reviews about an item listed for sale, possibly with the intent of preventing a sale or reducing a price below what it is worth. That may even include making absurdly low low-ball offers.
If there were a reasonable sale posted, and someone came along saying "Your machine smells of elderberries!", that might be ad stomping.
I can see how on some forums, where selling things is a major part of what they do, that that could be a serious problem.
We haven't had much of a problem with that here. Most of those kinds of sellers just go directly to eBay.
Ug, case in point:
https://www.ebay.com/itm/274840394234
Zenith OEM OS/2 1.0 for $2000? Facts: Most collectors would probably want genuine IBM packaging, Zenith stuff isn't exactly sexy. Looking at recent eBay sales I see a couple early OS/2 server products sold for around or over $500, but those are a different ballgame than client stuff. I'd love to know if any OS/2 1.0 sold for that much somewhere. Also, that seller mis-typed "OS/2" as "O/S 2" so they probably won't even get many views. From what I have seen, that might sell for a couple hundred dollars, so certainly worth something. Any of that too negative? Perhaps Bill Gates would pay that much for a copy to throw darts at? Too negative now?
Of course, on a forum, sellers can come back and somewhat counter negative comments. Things like "I think it is worth that much because [insert good reason that should have been stated originally, here]".