Most of us do not run a business or a retail store. I don't think we as sellers have an "obligation". We are simple pool players who enjoy the game. If someone listed something and later down the road decide its not for sale, I don't think they are obligated to sell.
Yeah but we should all have a grasp on right and wrong. He can sell his cue for what he wants .. But that guy is also right for calling you a jerk. Oh well...shit happens