Because those skills are the basis of this game. Let's try starting over without those skills. No mining=no essence, pure or otherwise. And as such, no Runecrafting. No ores, no smithing. No woodcutting, no firemaking, no arrows. (I'm fully aware they are also produced as monster drops, however Runescape can't justify removing them from fletching.) No planks either, so no (or not much) construction. No, fishing, good luck PKing with whatever fish it is that you PKers used to eat. Very little advancement available in the cooking skill either. Now, taking away PKing resulted in a better game. Not only that, but it also GAVE us something: Whiny morons like you. Now get your head out of your [wagon] and THINK.