You probably won't play both. Personally I think it's silly for them to bundle them but I can't begrudge Amazon for trying to move unwanted games (Civ 4) by packaging them with current ones. That said, you also get Stronghold collection for $5 which is a pretty good deal. Anyway, you might be able to find people willing to buy the keys for Civ 4 (assuming it comes with Steam keys) and Stronghold Collection (ditto) from you on the trading thread.