#1 It's WWE's way of giving him the recognition he deserves
There are those out there who don't 'get' Dolph Ziggler, probably because of his enthusiastic in-ring style that seems him taking bumps like Shawn Michaels. I, however, have been a fan of his for a long time and I'd like to think that even Ziggler's detractors can appreciate his worth-ethic, his loyalty to the WWE and the matches he puts on.
The fact that the WWE have trusted him with the new call-ups from NXT and have managed to keep him on the upper-mid card for years clearly shows that they have a lot of faith in the Superstar, but they've never quite managed to fully pull the trigger on 'The Showoff' even after the spell he wrestled two matches per Pay-Per-View or when he was the survivor of Team Cena vs Team Authority.
I'd like to think that this title run is the WWE's way of given Ziggler the recognition he deserves, and their way of saying thank you for all of the work he's done for them.