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To me this kind of talk is just
sour grapes. If you know your marketplace you will understand the value trends.
I follow several dozen fields of collecting, and each one has its own marketplace. They are all affected by people entering or leaving the market, current media news, or other things that can attract attention to the items in question.
Even individuals can affect the marketplace, as they pursue pieces they may need for their collections.
I think far more damage is done when people list items for .99 that are routinely selling for $300-$400 dollars.
But if someone is happy to get $100 for a $400 item to save a $2 listing fee
well knock yourself out.