#1 Brock Lesnar
It's no secret that the WWE loves to rely on Brock Lesnar and while this has been known to drive fans crazy, there are two distinct reasons why the company continues to do this. Of course, not everyone is going to agree with these points, but they aren't the ones running a multi-million dollar company.
The first reason has to do with Lesnar bringing legitimacy to the WWE and that is a very powerful weapon for them. Whether the WWE Universe wants to admit it or not, any segment that involves Lesnar looks like it hurts and that allows the fans to suspend their disbelief.
The second reason is that he is virtually a guaranteed draw if put in the right situation, which is nothing to sneeze at. In fact, it's proof positive of just how important a guy like Brock Lesnar is to this company. He even helps create media buzz in the mainstream and that is something WWE has struggled with at times.