Ok, here's a funny story. Back in the '90s there was a record store that sold mainly rock, psych etc. but had a small number of metal vinyls. After a trip of the owner in Germany, he bought the vinyls of a record store that went out of business. When the records arrived he asked me to help him to put prices on the metal vinyls because there were many that he didn't know.
The metal vinyls were around 500 to 600 hundred and except the mainstream stuff (like Maiden, Dio, Manowar, Metallica etc.) there were many power metal vinyls (like Cirith Ungol, Hexx, Vicious Rumors etc.) that he didn't know their values. Our deal was that i would price all of them and if i find something that i was interested i would put it aside, so we could make a deal and i would buy them.
The only records that i was interesting in were the HAMMERWITCH and the ARMED FORCES (Iron Works). After all the work, i got the 2 records and we started to make the deal.
My plan was to pay $10 for the Armed Forces (which back then was a normal price, you could easily find it back then for that price) and $50 to $60 for the Hammerwitch (most of the dealers back then listed it for $75).
So i start telling him what my proposal was and before i finish he says "Oh man, the Armed Forces is a very rare LP, it is on the same label as Jag Panzer so $10 is very low". I tell him "but most of the metal mailorders have it for $10 to $15 !!!" and he goes "No, i am certain that it is an extremely rare record but for you i can give it for $20". You may understand how angry i was because i was sure he did not even know the record, he just thought that i was trying to get it cheap. And i felt like a fool for helping him and for being honest.
So i tell him "Ok, if the Armed Forces is so rare, what about the Hammerwitch?" and he goes "Oh, i know this one too. It is a very easy to find record so you can have it for $3" !!!!