The market is what a seller will take and a buyer will give.

Certain things in areas will fetch a premium above "book." Campers in CO are one of those things in my limited experience. So are 4x4s/AWDs. Not so much in FL!

Remember the used car market after Cash for Clunkers? Book didn't mean anything. I was surprised what I got for a trade in 2012 (yes, I know the pricing games and it wasn't my first car deal).