I look at football a lot like religion. Would you change your religion based upon who was paying you the most? I wouldn't. There would need to be something fundamental, something other than money, to cause me to change. You being in the no category of the poll has no bearing on what the "correct" answer to my question is, although it would seem that most AFL footballers do share your "make hay while the body holds up" view. Not that I blame them.
But that doesn't change the nature of my question: "would a member of Demonland change Clubs just for the love of the team? And if so, would they take a pay-cut, just to get it done?" It appears the answer for most is a yes.
Also, you spoke of "maximising your returns." I agree that maximising returns is what everyone tries to do. But sometimes we might sacrifice monetary returns in the name of something else. We've all sacrificed time working (and thus earning money) for free time, holidays, time with family, or whatever; which is when the black-and-white "how do I make the most money" ceases to be the be-all and end-all of "return maximisation." Giving up money at Carlton, for example, might be a good idea if you want to win a Premiership in your lifetime, or if you simply would prefer not to feel dirty even after having a shower.