£200 for a Puch needing restoration. It would only be worth half that in pristine condition.
https://www.gumtree.com/p/bicycles/puch-vintage-bike/1486769514
I may be wrong, but £500 for an old Bianchi that hasn't been used in 25 years does seem a tad excessive: https://www.ebay.co.uk/itm/395958642142 Especially as it's got old Shimano EX?00 components and a non-original saddle.
View attachment 754306
It's a bike. £25 on a good day
https://www.ebay.co.uk/itm/316005159079?_skw=dawes+audax&itmmeta=01JGCE7S6PAAX48ZGT75MRA1GZ&hash=item49936010a7:g:KTwAAOSwL4tnXxRn&itmprp=enc:AQAJAAAA8HoV3kP08IDx+KZ9MfhVJKmZRl5TScT9IhJLVW2c+MVGT72nrcYnCvZSe1Vc06xnFhIJdetpcqqfGx1hkbWhV6TQwAxB3DzcFLbIKnsF1ela9p39DZd9YcZXeHQdLF5VZhXbb4d5wIMxsGVAyJQXJwo1+jpJaJo4BIO2hdUGd8djLyay1rkfXgjJFoOrhBZXs2rOVfCqh7edIujEKSGKO8CVwMtJrFcwAdU1uEgAWqGr4n9Z/Ncp0yYcESRDVUlct1Wt2jHhFsLCVicMZxDz608XQ9ps8pQvxnPJSySTvtS2MMFOEZeZMGsKER6ZkjeCvg==|tkp:Bk9SR7KTn46DZQ
A Dawes Audax Clubman, early 00s version, I think it might be a bit overpriced.
Fixed the link fo you
"I priced to sell I will be open to sensible offers." - Sadly the seller seems genuinely deluded; reckon it's got to be worth about 10% of what they're asking..?
Does beg the question of why they've replaced it with a - by their insinuation - inferior modern bike..
Also, those photos... Imagine you're listing a bike for sale. "I really need to present this properly", you think: "let's get some photos of my precious bicycle. After all, I'm asking someone to spend £800 here. What's the best photo I could put first in my listing? A driveside shot of the whole bike? An artfully composed and lit scenic shot of it out in the wild? No, I've got it! A blurry close up of the low quality left hand shifter!" Who are these idiots?
Suppose deluded or desperate. I'm not going to find out
Maybe it's a money laundering ruse.
Part of the blame is covered on another thread "ebay no longer charging private sellers". If you remove the cost-to-list you get stupidity like £100 if you're lucky bikes being listed for £800.
It's the same for vintage film cameras which I'm vaguely interested in; people keep on listing for stupid prices which clutters up your search and makes browsing unworkable.
I was really into elderly film cameras a few years ago. I still have a lot of pretty cool cameras from the dim and distant knocking about the house. They're fun to use, but as you say are worth very little while being subject to the "it's old, so it's worth a fortune" mentality which also seems to afflict undistinguished old steel bikes.