I wouldn't go off of the Blue Book or a gun traders guide when pricing a lightning...no flipping way. Take a look at what they have a 6" blued python listed at and tell me you'd sell yours for that price. Those guides are great for teaching about how to evaluate a gun, properly describe it's condition, and fill you in on unique and short run variants, but up to date pricing isn't a forte'. Not by a long shot.
Agreed, Used as a guide only. Should and always do take into account, historical value, conditioning, and other many aspects. Traders Guide is exactly what it says, Key Word "Guide"...