So would you say that there is a discrepancy between the quoted price and the actual value of the card, and the successful manager is better at exploiting the difference?
The quoted price cannot be the actual value of the card. The actual value of the card is going to change depending on the ballpark and what ballparks are in the league. And absolutely the more experienced managers are able to identify and exploit this better.
A pitcher for example with multiple #s is going to be worth less in a bomber park than a large park because one park is going to trigger those #s while another will cancel them out. The pricing is set for something in between.
One note concerning all the submitted potential losing lineups. I did not notice any that mentioned ballpark.
So is it possible you could take some relatively successful 90 win teams that were built for an extreme park, dump them in an opposite park and change it to a 90 win team? I think the answer may be yes.