Caveat emptor!
So true.
It's quite unlikely that any "collector" would pay those prices unless they literally had more money than brains.
The sad thing, though, - or the good thing for the seller - is that those sorts of people are out there. For example, I saw them back in the mid-'90s when DS memorabilia was going for way inflated prices on places like eBay (particularly on the last 3 Ross novels and the green card set). People paid those prices. And back then no one could even blame "bookjacking" because it didn't exist. But I suspect those buyers may have a lot of regrets now because prices for DS memorabilia are much more realistic these days...