Re: where to get accurate boat values?
It is always good to study the market for the type/size of boat that you are interested in. It is also nice to have some sort of reference point, like BUC or NADA, etc. Of course, studying the market can take some time . . . but I will offer these words of advice from my experience buying boats.
Boats only sell when buyer and seller agree on price, as stated in this thread. Asking prices will cover a wide range. If you look at boat Ad listings for particular brands/sizes/models you will tend to notice that the boats that sell are typically from the lower end of the range of asking prices. Usually the boats in the better condition at the lower prices sell, other ones do not sell.
Since I study the market in my area from time to time, just to checkpoint what my boat may be worth, and I went through the buying process last year, I have found a couple of notable examples in my local area.
1998 Formula 330SS for $49,900
2001 Chaparral 285 SSI for $32,900
These 2 boats, as an example, are in very good condition and have been on the market for over 1 year now . . . I recall these boats being listed last year at these same prices. So, what you can gleam from this is that a 1998 Formula 330SS is not worth $50K and a 2001 Chaparral 285 SSI is not worth $33K. If they were, they would be gone.
I have noted that similar/same model boats that were listed for less money have gone off the market and presumably sold.
So, to the OP and to anyone in the buying (or selling) process, check all your sources, (NADA, BUC, etc), check the local and even regional listings. Then, if you have time, watch the market to see at what price range boats of your interest tend to 'disappear' from the advertisement listings. That will give you a good idea of the price range where boats sell.
Having an in-depth knowledge of the market helped me get the boat I wanted at a good price, and that knowledge was particularly valuable during the negotiation process.