How often do you use an iTunes Gift Card to buy apps from the App Store?

     iTunes Gift Cards are the only way to buy applications from the US App Store if you are not a resident of the US state. Applications in the US App Store are generally slightly cheaper than those in the rest of the App Stores and as the price of an application increases, the difference between the value in the US App Store and the rest of the App Stores increases with it. . Unfortunately, iTunes Gift Cards can only be purchased from the US, but if you have an account on eBay, Amazon or any other site of this kind, then you can purchase such a card without any problems.

     Until now, I have not felt the need to use an iTunes Gift card to purchase something, but I know that there are quite a few of you who use this method to save a few bucks when purchasing applications. My question for you is: how often do you use an iTunes Gift card to buy apps, music or movies from Apple stores. Alternatively, I would like to know how profitable you think this alternative is for purchasing applications, is the money saved worth the effort?