Yeah, because it's so hard to check body, engine and tranny numbers. I can see a time years ago when a service like that was needed but if you can't check your own numbers and dates by now...
I know what your saying, "But Pete, there are so many people stamping out their own blocks ect"
SO WHAT! This is the reason there are more matching number cars now then there was 20 years ago. If you have to spend $1600 to be sure, go back to Corvettes