My understanding is that the original purpose of the NADA guide was so the loan, insurance and dealer parts of the industry can have a central reference that they all can accept -- Tax guys too -- Everybody likes to have a published value to point to!
I guessing, but the dealer's black book probably contains highly localized data on what they can take in used and what they can sell for, with factors that are likely specific to the dealer's profit margins. Of course, with computers, it is easy for dealers countrywide to satisfy local requirements by importing the used stuf. I recall a friend in Florida being contacted by the new owner in Wisconsin about the maintenance -- That trade-in truck was moved a long ways compared to the old days!
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