The Argument is that Horde just get what we want, when we don't. Sure there are people who will ask for Dark Rangers, but it likely won't happen. He is also implying that the Horde doesn't have that, when we do.
My point is, his argument is invalid because he's trying to justify High Elves by saying "they are an NPC and we should have them." Well that's not the case, by that logic, we should have Dark Rangers for the Horde then, but logically speaking we won't.