This thing is barely a hundred pages and the joker in the top right is trying to get more than sixty five bucks for it
Maybe they’re faking your signature? So it’s a ‘signed’ copy.
They’re not selling signed copies. They’d put that in the title, not sell someone a copy with a surprise signature that the buyer wasn’t told about.
They’re dropshippers, they use bots to look at cheap products online then advertise those products for higher prices so they can pocket the difference. It’s free (unless they were stupid enough to pay for the software, but even then, any individual use is free) so anybody buying anything from them is pure profit. They don’t need to be reasonable, they’re fishing for an occasional sucker. There’s no explanation for the price increase (beyond wanting to make free money), no logic justifying why it’s worth more; they don’t need to do that. They have almost certainly never heard of this book and are unaware that they’re selling it. If they’ve interacted with it at all, it’s to skim read the title and arbitrarily assign a price markup to it, but much more likely they have the software doing that automatically as well.