I hear the points you guys are making, and from my viewpoint you're both right. These games are ridiculous, and these sellers asking the moon for cards - including those with much lower proven sales history - are delusional. I think the key point is to remember that with these sellers, their priority is not to sell these cards.
What that priority is, who really knows, ask their therapists . But for me, I equate it to people with 900 tinder likes who are still wearing out their index fingers swiping left and right. It's not about meeting people, it's about looking for validation of self or some other disorder.
Now and then I've looked at the sales history of these hostage holders, and it's revealing. They do sell cards, and the sold prices are always 85% of their asking prices (or whatever). But the number of cards sold is low. Maybe they think they are realizing the greatest return by holding onto these cards until they get their 85%, but I seriously doubt it. Anyone in sales knows that the point of selling things is to sell things. Of course you can't give them away, but you also can't hold onto every card hoping for that 1 in a million buyer. They have huge inventories of awesome cards, priced at astronomical prices, with ebay listings set to infinite repeat.
And the little games that these sellers play with their "original" asking prices of say $1000, but immediately "marked down" to $400...well that is also revealing. Anyone who does that little sleight of hand simply so they can say "60% off" is not really the greatest seller.
So yeah. These kinds of games really blow. But there's no point in making a reasonable offer on any of these cards even if it's backed up by previous sales prices. Anyone who lists a card at 10x its market price and plays little games with it is not the kind of person who will accept an offer at 10% of asking, regardless of what the markets says it's worth.