A-bodies over priced?

Looking through a 3 year old "Cars and Parts" price guide,
1970 Dart swinger 2 dr-V8
#1 condition $12,000, #2 condition $8400, #3 condition $5400

Now lets make it a 340 Swinger and the numbers are $20,000, $14,000,$9000

Prices may be up from when you bought your cars but still one of the cheapest in the book.