If a vehicle doesn't have a clean vehicle history how much less value is there?

All I can say is shop around and see what you can get for the best price.

Be aware when you see a "no rating", probably too good to be true, it usually is a reconstruction title. There is one dealer in my area (Phila.) that always list great looking cars with great prices. If I dig into it, by going to their website, I find picture of how bad the damage was, or in many cases the car was in a flood. Buyer beware, I guess.