You will only find Harry Potter and the Goblet of Fire the video game useful if you are a small-r republican. Every copy sold means more cash in the personal money bin of author J.K Rowling, and therefore a larger figure distinguishing Rowling's fortune from that of the second-richest woman in Britain, Her Majesty Elizabeth II. If you are a small-r republican, you may find this amusing enough that you will want to contribute your own small sum to the greater cause. Failing that, keep your money for yourself. Or spend it on a Harry Potter book. Or on another video game.