#4 Health
This one applies to pretty much all forms of MMA for the former WWE Champion. At this point in his career, Punk has racked up a whole host of injuries that are surely taking their toll on his body. Whether it was the staph infection, concussions or numerous knee injuries, there's no doubt that Punk carries alot of pain around with him on a day to day basis.
Even during the preparations for his debut he suffered another setback through injury, and it's getting to the point where he needs to think about his long term future. He has a wife and a family to think about, and one more big injury in another fight could wind up causing more serious issues.
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Call us pessimists, but we believe that the smart thing for Punk to do is to use his head as opposed to his heart.
Speaking of which, here's another factor that plays into health.