Padruig, I have experienced the same thing many, many times. I indeed enjoy checking out any antique/junk store I can find.
Just remember, they are fishing for suckers! A jaundiced eye, and a low-ball offer can capture some surprising treasures. In the last year I have found a rare Remington surveyor pattern, worth maybe $250 - for $15!! That's after looking in ten stores at 100s of overpriced junkers!
I don't know or care exactly what ignorance motivates some of the outrageous prices, I just care about the rare but brilliant un-recognized treasure! The thrill of the hunt!!
Patience is the key, IMO.