Simmons nails it:
http://sports.espn.go.com/espn/page2...simmons/051223
The whole article is spot-on.
One paragraph:
"Fans can be incredibly unrealistic and naive. We expect athletes to maintain an unyielding loyalty to their current cities, even if they have been playing there for only 3-4 years. We expect them to understand the "importance" of something like the Sox-Yanks rivalry, to think exactly like us, to say to themselves, "Wait, I can't switch sides to the Yankees, that's our archrival!" We expect them to feel hatred for the teams that WE don't like, ignoring the fact that rivalries thrive solely because of the fan bases, because we're the ones keeping them alive. And we expect them to turn down Godfather offers out of loyalty to their fans, only we'll turn on them the moment they start struggling."