Most people thinking this is a good thing are missing the point.
This premium service isn't important. The whole idea of an extra "premium" subscription is the problem.
Nowadays, you wont care if you can invite people from real-ID or not. But what if in 2 months from now, with premium subscription sales going up, they decide to give MORE to premium subscribers? How would you feel if the next tier content, or next arena tournament, or even next profession, are only for premium members?
Allowing them to START offering premium services gives them the grounds to expand upon it to the point where playing the game as premium or as a 2nd-class subscriber, will have huge differences on your gameplay.
Stop nitpicking on what is given to you at the moment, start looking forward to which paths it opens. You lot wouldn't last a second on a chess board.