I sell cars for a living. The saying in our business is "A good deal is a state of mind!"
I bought a 2011 Bianchi Sempre Ultegra in mid-June, knowing little about bikes and the "BBB". I paid $1,000 for a bike that is in great condition and has some extras.
BBB says the MSRP in 2011 was $3,000. They value it in "Very Good" condition at $850.
I just shrug. It's a generalization, nothing more.
My "state of mind" is that I got a fair deal. What's more important than that is I love the bike and enjoy riding it, 851 miles later!
Gary