Yes, but the best deal possible may not only have to do with the contract figures. Murray is not dumb, he recognizes that there is true value in playing for a team as popular as the Dallas Cowboys (more endorsements, etc.) and we know he wants to settle in the Dallas area after football. How much better is the quality of life going to be if he is recognized as one of the key players to bring the Cowboys back to greatness? He will be hailed as a hero in the Dallas area, he will never want for another thing.
These are the things he is thinking about when he says that "the money is irrelevant to a certain extent." Could he make more going to a place like Jacksonville? Probably, given that they have more salary cap room than they could possibly know what to do with. But what happens at that point? He becomes the next Maurice Jones Drew, a great and highly productive player that the general public knows almost nothing about because he was stuck in that media black hole called Jacksonville. Is that worth an extra $2 million/year? Not to me, it isn't. Yes, Jacksonville isn't the only team that's going to be interested and a team like Indy could certainly be attractive, given they have their young franchise QB and quite a bit of salary cap room. But Indy is NOT America's Team. Tell me, how many former Indy players are in the broadcast business? Now count the number of Cowboys players in the national media -- Jimmy, Aikman, Woodson, Irvin, Johnston, etc. etc. etc. Again, there can be real value playing for a team as popular as the Cowboys, just a matter of capitalizing on the exposure.