That is very often true... but not 100% true.
Point in fact.
I saw a cherry 1975 15' four seat, frp Crestliner with bimini top, its original 50 hp Johnson and orig. trailer for $1200. 250 hrs. total use. Had been on CL for less than couple hours. 120 miles away. I immediately called and told the guy I'd be there by 9 AM tomorrow. Having seen the photos and talking with the owner I felt that boat might be a real deal. Boy was I ever correct!
The guy was there; a great fellow! He took it and me to a near by launching location and we went for 40 minute cruise. IMO that boat was and after some 6 years of us using it as our tow behind runabout still is worth in the high two's to low three's.
He dropped it off at our marina and drove me back to his place so I could get my SUV. I did not once offer any lower because I could tell he was set on the price. Handed him 12 crisp $100 bills and offered him another $40 for taking time to do all he did for me to review the boat and then deliver it too. He refused any extra cash even when I offered it twice.
As I started my rig he told me that three persons had called soon after me last night. To each one he said that I was coming at 9AM the next day and driving over 100 miles. He also said the second caller had offered him $200 more than his asking price. He told me he felt he could trust me from our discussion and was glad that I had the boat.
Now,
that is the perfect way to do business!!