Simple human nature..BUT, shop around..they still have competition and if you don't absolutely have a need---WAIT.
Now, the other side of the coin..I'm sure some of the folks griping would have no trouble trying to sell a gun they purchased years ago and heavily used for more than they paid for it. Used gun prices (even before the hysteria) have always amazed me. Was at a gun show (private stuff-no dealers) this past weekend and in many cases I saw crusty used stuff with price tags higher than they are new (now) at the LGS.
We all want to fetch the highest prices we can when we sell stuff (and most of us want less government intrusion)--bit hypocritical to want to have limits on your purchase prices but not your selling prices.