[dionidium]

> I genuinely can't understand the thought process of a Yankees fan.

There is very little free agency in American sports fandom. People are (for the most part) fans of the team local to where they grew up. (This kind of bums me out as someone raising kids in New England, which is not where I'm from, and so not whose teams I root for.)

[bluGill]

Backing the local team always makes the most sense. In NYC you can choose Mets or Yankees (though where you live in the city affects even that). Choosing a team from some other city means you see your team play much less often and only after much effort. Worse there are less people to talk about the game as nobody has seen your team play and you didn't see their team plan. (except when your team plans the local team)