I agree with Jerk. The women seem to be a ratings draw, and make money for the WWE, not to mention publicity from things like Stacy doing Dancing with the Stars. And if the women were just interviewers or valets, their visibility would be limited. So, the WWE gives the people that make them money larger roles, which ultimately include angles & actual matches.
Then explain why Rey is getting squeezed out of the WM ME spot in favor of Randy Orton.
There's an exception to every rule.