I smell a Red Hindu in the BST soon..
(Kidding)
All of these cards have ballparks in prices, but in the end are only worth what someone is willing to sell them for or what someone is willing to pay.
On any given day that price changes to some degree. There really is no set price or market value for these things just a rough area of prices which go up and down based on supply and demand.
Also these price swings (up) are often driven by hype and someones need for a card. Example a Red Hindu Murphy to me is worth more because of my Murphy collection. But using that possible sale price as a line in the sand to set prices for any other Red Hindus is most likely not the norm.
Example JP will not see near the same cash for his Auth Plank as the previous Auth Plank from the last REA. For a number of factors.
John