Well, that's a bit different. Firstly, Live Aid is a charitable foundation, so rather than have unscrupulous characters make money out of it Geldof decided to put it out officially (which I believe wasn't his intention previously) to make sure that at least the money being spent would go towards the right cause. Also, Live Aid is more famous than Knightmare and has a bigger audience. Coupled with the charity issue, it's an entirely different beast, so comparisons aren't easily made here.