The dealers time is valuable too. I'm sure they have tire kickers looking for deals coming through almost each and every day. I have never had a problem getting a "Deal" through a dealer but I show up Cash and Check Book in hand and make it known to them that I'm buying (right now if the price is right) and not looking. I expect them to come up with their best offer within a couple of minutes and if not I just head on down the road to the next dealer.
I survived the Great Folk Music Scare of the 1960s (when it almost caught on) !