Yeah, they've said time and time and time again that there needs to be some kind of incentive to get people to play. And believe it or not, there ARE PEOPLE who play ONLY TO GET GEAR in PVP. It's a shocking idea, to not care for competitive rewards, I know. I have a friend who is like this, who literally doesn't care for mounts or titles, and said he would hate it and would quit if they just made all gear available.
Pretty sure the vast majority in this player group only play RBGs. As of now, gear has almost nothing to do with a players incentive to play arena.