I'm assuming Nix is talking about ESPN coverage. Not only is our Alumni association larger, we are more widely dispersed around the country. MSU has ~10% out of state students while Michigan has over 40%. Tuition isn't cheap so many of those people are coming from lucrative markets on the coasts.
The nutty Michigan coverage isn't so much about Harbaugh as it is a signal to the Big Ten that Fox wants to party.