You get to deal with this in our hobby all the time. Just walk away if the deals aren't good.

The junk sellers have found there is some value in old bikes, so they've started buying them. Often they seriously mis-appraise them, missing dents and other damage, getting models wrong and confused, and so on. You just have to move on.

I attend a local auction some times, and I get asked a lot of questions about the bikes there by various junk re-sellers. They miss some ridiculous defects (like dents thru top tubes, etc) and because of smart phones, do web searches which give them dangerously incomplete information. They'll ask me about bikes (because they know I'm the one individual there who knows exactly what he's looking at). In the past, I've shared information, but now I just tell them "If you don't know what it is, don't bid on it."

When selling, these folks usually inflate the value of bikes ridiculously. It's best to just walk away. No point getting mad about it-- a good deal will materialize eventually.