I think what many of you are overlooking is the fact that very seldom (if ever) are vehicles with major and/or structural damage actually repaired. Those are totaled, simply due to the high cost of repairing, and end up with salvage titles. "Repairable" vehicles are very unlikely to have major damage that will compromise the safety of it's occupants. So again, how does a vehicle with minor damage that is repaired properly sustain "diminished value"? It doesn't. At least it didn't, until "sheep" started drinking the koolaid and were convinced that they were "owed" something more than what traditionally was accepted. Not a whole lot different from outrageous court settlements for "pan & suffering" or "emotional distress" that are commonplace today.
JALLEN4 explained the whole "Carfax" scam extremely well. Just a couple years ago, I purchased a 2008 Hummer H3 Alpha with a very clean Carfax. No accidents, no major repairs. I have since found evidence of significant right front end damage. Repaired correctly, it still runs/drives perfectly. "Diminished value"? I think not. Yes, I would have still purchased, for the same price, had I noticed it at that time.