Quote Originally Posted by Zundfolge View Post
The problem with used car "values" is that KBB is owned by AutoTrader (so they have incentive to inflate the value of vehicles since they facilitate a big chunk of the used market) and NADA is owned by JD Power (who also has incentive to inflate the value of their vehicles so they can sell advertising to car companies for more).

So the prices in the price guides have been massaged and don't really reflect the real market value of things (or worse, they have enough power to distort the market value).
KBB is on crack. NADA is sometimes better, in my limited experience.

Blue book of gun values calls the importer of the firearms for the current value every year. They print whatever the importer thinks it should be. Very little of the blue book stuff is an exact science.