And you can also compare prices for works by artists with a rating - 3A:
Bogomazov Alexander Konstantinovich (1880-1930). Nagorno-Karabakh, 60h64, oil on canvas
sold for 1.267.000 $ (736.000 pounds), (Sotheby's
http://www.sothebys.com/app/live/lot...p?lot_id=4JPLH), December 2005
and
Podobedov Roman L. (1920-1998). 1976 50x35 cm, canvas, KM
sold for 143 $ (5.000 rubles) for Gelos (
http://www.gelos.ru/2009/february/13.02/art.shtml), February 13, 2009
So just compare the prices of works by artists with one rated at least not correctly. A look at the correct pricing of a specific author.