He plays for the name on the back of the jersey [Rodriguez] and not the front [Yankees].How about us academics? Do I play for "Northwestern" or "Fortnow"? Even at Northwestern do I play for the department, the school (McCormick Engineering) or the university?
Americans, in general, change jobs more frequently than people in other countries. Academics a little less frequently, a bit because of the tenure system. Nevertheless academics do move around and I've had my share of job changes. But when we do take a new job we immediately put our loyalties there, now that I'm at Northwestern I want Northwestern to succeed at every level and I put in effort to help make that happen.
Even though I left University of Chicago, I had many good years there and I still want the department there to succeed. But I no longer play a role in that effort.
In the end you have to do what's best for your career and your family. Occasionally that means considering new opportunities. But when an institution supports you research, you have a responsibility to make it strong as well.
Luckily in baseball and academics these goals are often well aligned. When Alex Rodriguez hits a home run he helps himself and his team. Do great research and you make yourself and your university look good.