If you were playing in a tournament, it is not such an easy call everytime. Winning that specific hand does not gaurentee you money in the tournament (unless your already ITM which then it is an easy call), and if you are risking a significant portion of you stack then it is not such an easy call everytime.
A tournament scenario doesn't make the decision that much harder. In the long run the chips you possibly save by folding is outweighed by the chips you'd gain by making the call. This is not even considering the chances that your opponent might be bluffing, which I feel is a much higher probablility in a tournament as oppossed to in a cash game.