Star Baseball Player's Salaries - ROI?

This is a very good point. And it’s applicable not just to the call-ups that the big club will actually use. Major league salaries work as a necessary incentive for guys who will never earn even one day’s worth of the minimum. As I said in another thread,

The whole development system is required to produce modern major league teams, even the bad ones.

In a sense, all of a major league organization’s revenue is dependent on the prospect of a big paycheck to people who will mostly never be paid that much. Because the guys who will be, both stars and journeymen, needed to play with and against all those other guys to get to the point where they could first occupy that major league roster spot.

Now, personally I’d like to see some of the major league revenue pool diverted to actually pay minor league players, so that the system could continue without such a degree of unrealistic optimism, and it would become a reasonable choice for a minor league lifer to stick around as long as he wanted to and could keep up. Let the small towns keep a hero around! They are helping to build the major league organization, even if they never go to Chicago or New York themselves.