Stupid people who fancy themselves as shrewd businessmen despite possessing less market experience than the average department store clerk often come out of the woodwork during and even after a shortage in attempt to profit from scalping/price-gouging, but showcasing their ineptitude, they don't bother to check what the going rate for the item they intend to sell, they just price their wares arbitrarily based purely on greed. It's basically how a complete fool thinks supply and demand works; "Supply is low and demand is high so I can charge whatever I want and eventually somebody will buy it!" Meanwhile, it will most likely never sell, and if it does, then it's only because a bigger fool bought it without shopping around for a better price first.
This is an example of the behavior I'm speaking of. Last I checked, new M&P 2.0s were going for between $600-$700 depending on the model, and there really wasn't much of a shortage of them either, they were in stock pretty much everywhere I looked. So yeah, it's just a fool who was late to the party when it came to hopping onboard the scalper bandwagon, and like most scalpers has no idea what they're doing, only succeeding under circumstances of extreme desperation or foolishness.