Poor examples, I’m afraid. VIP keys doesn’t provide one with any content that can’t be already accessed, they’re only giving higher chance at obtaining certain kinds of resources. Similarly, Deathknight armor only adds a multiplier for resources any player is already getting by default.
What really hides behind the paywall at the moment is this:
How do I get those without paying 4.99 for each, exactly?
The fact that current weapon situation exists, to me at least, looks like a hint of extreme shortsightedness when developing the game.