Hehe... no doubt. The same magic applies to the IT industry, picture framing shops, some electricians ($4300 to move my electical panel in my wall, when the wall is already open?? c'mon!) and the guy you see when you finance your car.
Buyer beware, join a club, educate yourself, get a second and third opinion, and only be taken once. DIY whenever possible, and use your contacts when its not possible (that electical job cost me nothing but a future favor).