The reason I assume they don't do this is so price rises aren't distorted. Someone posted earlier about being happy if Viney gets his average. That number would go in the system and then distort the averages for the next 3 weeks. I know I wouldn't be alone in crying bloody murder if that happened.
If they were going to give scores of any type, it would have to be related to their CURRENT price (i.e. giving the average score for a player of that price). They'd have the numbers in their system to do that type of thing.