I bet half of them don't even have a single round fired through it. Bunch of people thought they were gonna get rich buffing the price up on a shield because for awhile they were in limited supply. There are a shitload of people who buy guns for the hell of it and then never shoot it and sell the thing. I've seen it here for years. I also had a local at one of the local gun shops who would buy a new gun, shoot it terribly (putting 100 or 200 rounds through it) blame the gun, and then sell it. He turned out to be a great source of basically brand new handguns with the first 15% of depreciation peeled off them. There are probably hundreds of people who do stupid shit like that. With the M&Ps in MA its worse because a bunch of people piss their pants when you tell them they need to get their trigger repaired, because some gun shop commando or a LEO told them it was illegal.
-Mike