I tend to agree with CAFR on published values...By the time the information is collected, edited for accuracy, and then actually published and printed, the information in usually out of date...
I have a local gun dealer that, if you take one in to sell, will drag out a value book and offer the lowest stated value...Needless to say, mine that are for sale don't enter his shop...If he is trying to sell one, he will point to the "asking price" on Gunbroker, even though the item has no bids of interest..