*Membership spots not really limited!
Out of all of the guys who came over to the WWE when they bought WCW, Booker T was easily one of the most successful. I wouldn't say that his success in the WWE was because of Shut Your Mouth but that little bit of extra exposure probably didn't hurt. All that I am really trying to say is if you're going to put The Rock on the cover, what's the harm of putting CM Punk, Antonio Cesaro, Daniel Bryan, and/or the Shield on there as well?
The Rock is a much bigger, more important star than them. They won't benefit from it. No one cares over a decade later that Raven shared a video game cover with Hulk Hogan. You put the person who will sell the most on the cover, not a bunch of a midcard guys who will then in effect make The Rock look like Just Another Guy.