It's somewhat ironic. Despite the fact that sports fans can be just as dorky as sci-fi fans, and that many people are dorkily fans of both sports and sci-fi... whereas it does seem like our most major sci-fi/fantasy writers aren't and probably assume their fans aren't either.

Which, I think, is why we don't see as much sportstalk on the shows anyway - and consequently in the fanfiction.

As to the homoerotic subtext - presumably, you can just extrapolate from the existing subtext already in sports and suchlike...