fan that it matters that much to them, so it is easier for them to pick a winner and stick with them. If Utah cycles down over the next few years they may jump to something else. My son only really cares about pro sports now and only watches the BYU games to hang out with his old man.
If that is the only reason they are willing to hang out with you, it's a great reason and you will still get the benefit of that connection.
The avid fans and the least avid fans seem to stick with a team but those in between look to be associated with winners and can be quite fickle.