Sawyer is a man that respects money and freedom equally...he sold out another inmate for a cut of the money and his own freedom. Whats to say that he wont be willing to help them as long as it gets him off the rock...which considering Ben referenced Alcatraz(another prison) makes sense if you think about it.
i was referring to this. erm.. not much difference for sawyer to leave that alcatraz.. even if he left, he would be warned to ever go back to the jetty again and its back to square one. and i'm sure sawyer knows it so prolly he wont be that willing to help the others do what they want him to unless KATE is involoved.. ^_^