Just recently I have come to this realization myself. I own all the expansions for Arkham Horror. I'm not sure how many people have played that game with all the expansions....but wow that makes the game pretty dense (rule + time wise). I'm thinking like others have sadi, unless the expansion adds something that needed to be fixed, or really adds something that the game didn't have then I'm thinking I might give it a pass in the future.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.