Unfortunately these types of people dominant this "hobby." I call them the weekend dealers the guys that act like they are doing you a favor buying an item for pennies on the dollar so they can try to resell it immediately for several times what they paid for it.
Just look how many times a 'pickup' post is followed by, "if you ever want to sell it...". My neighbor just bought a new car. It would seem kind of goofy if I asked him if he was interested in selling it. But it's the norm here, because you have at least as many flippers as collectors. Obviously, in order to make any money on a flip, you need to get a swell deal when you buy.