couple A's, several C's, a few b's

The cars that they are willing to part with have only value in one’s self putting in the work to disassemble and cut them apart for parts. There is no value in whole for parts, you just don’t know what you are getting into till they are apart. You would have to get them for scrap value to protect yourself from losses.

The cars they are not willing to part with are the cars that may be worth some money, but still a great unknown from pictures.

This all leads me to believe the sellers just want to count benjimins and not do any work. They are savvy just enough to hang onto what they believe is a bigger payday than they have coming.