When I was in Seattle a few years ago we went to this record shop and while there was nothing of real note in there, there were a couple of bits I wanted. Now let me tell you, they were not sleeved and while they played ok, they were in pretty bad shape over all. Anyway, I took them to the counter where the guy proceeded to slowly produce Manship's guide from under the counter (like it was his secret weapon) and check the values. He then went on to ask for the full amount stated in the book. Did I say the records looked like they had been skated on?
Fair to say all of us left without buying anything.