>>53165178They deny a LOT. It's really annoying. If you trade in enough you'll know the guys who are chill and the guys who are trying to jew you out. They'll mark your cards as MP and sell them LP/NM. Save your big trades for when the cool guy is in.
Some card shops will put out a buylist that list all the prices they'll buy a card for. Usually they'll accept all Vs, holos, and older gen reverses/holos. Never trade to shops that just pay you the TCGPlayer price with a mark down.