I think some of the bargains mentioned have been private sellers who don't know what to do with old Macs, and indeed the biggest deals come from the spares/repairs sales where the buyer can see an easy fix.
I've not bought into PPC for a while, but my two PowerBooks came in at £75 (top end in my opinion, and cost me some RAM and an SSD as the hard drive started dying the day after arrival), and only £45 fully working with 2GB RAM and 128GB SSD already installed (this one is probably a bargain, although I'm getting an occasional irritating freeze after sleep).
Getting a third PowerBook for £20 is probably a complete fluke and not easily repeatable, hence I jumped in quick when I saw it. If it's a runner it'll need RAM, SSD and probably battery to get it up to scratch.
I've looked at some vastly overpriced machines, but never actually seen any false claims for what an old Mac can run Mac OS wise.
By the way I was actually running CS4 as my photo editor as far as High Sierra, until I bought Elements 15 for something more modern, and in fact CS4 runs pretty well on my PowerBooks.
Cheers
Hugh
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They can and do hit high prices even from that low starting price. Sometimes it’s sheer chance, sometimes it’s geography and sometimes it’s how much info the seller chooses to add. I know that ending auctions on a Sunday tends to drive prices upwards as does offering cheap delivery.
As for unrealistic, this is possibly a sign of things to come:
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For £500, I would want polka dots. Lots and lots of polka dots.
You see, I wouldn't ever pay that price for a clamshell; I'd rather bide my time for a cheaper 'broken' one. The fun is actually in the restoration to fully working than the original purchase