That graders are capable of Undergrading, or Overgrading a card?
Isn't that what they use to say about some dealers in the early '80's?
The graders were suppose to eliminate that, or something to that effect.
The only difference that I see is ...
the graders are great with corners, and sides, BUT some dealers, and collectors are better at Authentications.
Is it possible, that the reason why cards were cheaper during the non grading days ... was because we didn't have a
middleman Undergrading, or Overgrading our cards? 
Just a thought.
Joe P.