Some interesting answers already.
How anyone can expect a used car to be as new condition surprises me. I can spot defects on most newish cars - obvious un-repaired damage is one thing, fair wear and tear is to be expected.
I think the classic one is when someone sees say a £10k car for £8k and naively expects to buy a retail condition car for trade money. In the same way as some buyers expect that, you’ll find £8k cars being sold for £10k too.
Sometimes though you have to play the game, as most buyers of older cars these days all seem to want a bargain - so to get your £8k you have to ask £10k to begin with, etc. Because if you ask £8k, be prepared to get offered £6k, and so on
I generally try to buy the very best examples these days, rather than look for something that seems better value. As often in the long run the small premium you pay for exceptional examples (mileage, condition, spec etc) in the grand scheme of things isn’t that great, and typically you spend less on then during the ownership experience. Come resale, if you look after them you will often get most of that premium back too - and you get a nicer car to own/drive for the duration
I think the key is to be patient when you’re buying, works for me
