Most of the cards are played to varying degrees from what I can tell.
It is tough to determine the value if most of the cards are played. Are they heavily played? Lightly played? It also depends on what you bought the collection for. If you bought it to play the game, then the cards being played aren't as big of a deal. If you bought them to trade and sell, then that hurts the value (for you).
I would say that if you bought the cards largely with the intention of using them to play the game and you paid $50-$75, then you did a great job. $100-$125 then you did a really good job. Anything more than that is probably too much.
Hopefully you bought it to play the game with friends and to recreate a nice little playgroup in your area!
-wtk