As with all goods and services, vendors look for the uneducated and unknowing. If you knew nothing about gun prices and saw a used gun at a show with, let's say a sign that said, "Gun Show Special Pricing - $999. You might thing it must be a deal and if that gun appeals to you, you buy it. However, once you get home and start to research it, you find that you could have bought a brand new one for only $569. Happens all the time and as a matter of fact saw that very example at a gun show I attended this weekend.
It is imperative in today's economy that when you set out to buy something whether it be a gun, new or used, a car - new or used, etc. you must know what the prices are before you go looking. It is a buyer beware world.
When I am in places around the world and buy things like art work, beauty is indeed in the eye of the beholder and before I start to wheel and deal, I determine in my mind what I am willing to pay for that particular piece of art. If I get the shop keeper to meet my price, I am a happy camper. If he refuses to come down to my price, then I have had some fun negotiating and as they say, nothing ventured, nothing gained. I have had my fun and walk away only to find something somewhere else and play the game again.