Ok, I know I don't have proof since knowone is actually selling, but we all know the memory leak was voted for 2.5 buds, and this effect is better than memory leak in my opinion and in others opinions since people will pay more for this effect look around in other backpack.tf prices the cost of phosporous is higher ( http://backpack.tf/unusuals/95/Engineer%27s_Cap ) check here for prices. Also the fact that memory leak is orbiting, most hats which are orbiting never get such a high price eg, orbiting fire, orbiting planets because they are too small and can hardly be seen. You may disagree but maybe look up some sort of poll on effects and see which is better.