Help Me Understand Why

there is such a shortage and scarcity of good, driver quality (or better) Plymouth Dusters, 1970 - 1974. I am fairly new to the A body forum, but I have been looking hard for a Duster or Demon that has not been all boogered up or molested or a former drag strip car, etc. Were these cars produced in such small numbers and used up so quickly that there really is a shortage of these cars out there for sale? Or, are they that popular that the good ones have been taken off the market?

What are your thoughts on this?