I've been on both ends. If I am selling a game and get an offer too low, why piss the guy off and be a jerk? A buyer may be testing the waters and giving a low offer a shot , even if he would be willing to come up on the price to land the game.
If I am looking for a game, and one is listed higher than I'd like to pay, I don't see the harm in asking if the seller would accept less. If the seller has some arrogant response, it's a good way to learn who I wouldn't want to deal with in the future anyway. It takes 30 seconds to respond back with a polite "no thanks."If someone takes themself so seriously that an offer insults them, they are not someone I would care to associate with. Pinball is fun for me, not a place to deal with drama queens.

You have "big boy panties"? I learn more on here than I ever wanted to !