It used to have them in the past in the forms of hard to obtain mounts and titles but it feels like those rewards have been oversaturated to the point where they feel almost meaningless. The mage tower and other unlockable weapon skins in legion seem a step in the right direction but I don't know how well they will stand out once we return to weapon drops.
Does anyone else think wow needs some kind of reward for difficult parts of the game that isn't simply recolored and eventually given out freely to everyone? Some kind of thropy prize in the same vein as pvp elite skins?
Sorry this is kind of ranty it's a tricky subject to sum up.