I get tired of people acting like they are Pawn Stars or Richard Rawlins. I don't price my stuff with a big cushion to deal with jack wagons offering half and other such nonsense.
The best are on the FB sale sites when someone low balls you and you either say no or counter with a small price reduction, then they say "but I know a guy selling the same thing for half that and it's in nicer shape than yours! So that is what I'm willing to pay!"
Well dipshit, go by the nicer one for half price then!