This day and time information is so easy to obtain. If the guy had done just a little research he could have more money in his pocket. Is it our job or duty to educate him?
To be honest I'm a little torn on a situation like this. I understand what mod34 is saying but where do you draw the line.
My luckiest buy ever was an original 5" 44 Magnum found on a table full of S&Ws that a guy was selling at a gun show. I got it at an unbelievable price. Most the other guns were priced as expected. Should I have told him he had it priced way to low?
Now if it's some widow that's trying to sell her husband's gun...