Favorite team/logo options for other pro teams?

There are a variety of school logos to choose from, why not pro teams? Is it just a matter of demand and priority? How easy/difficult is it to add a favorite team and associated icon option? I don't know much about the goings on behind the scenes but this site seems like a small operation, so I completely understand if you don't have the manpower to devote to something as trivial as this. I just think it would be cool to have the option to switch your team logo around for different seasons.

On that note, have you ever considered allowing multiple favorite teams/icons? There are quite a few posters with rooting interest in multiple schools. Would it clutter up the interface too much, or put too much of a drag on page load times?