Wow, I learned something new today and I was hardly trying! Talk about home field advantage! I always assumed the umpires were assigned by the conference similar to football.
Technically they may be assigned by the conference, but the pool is small and if a coach has an issue with an umpire, they most likely will not be back. For most umpiring a game with top college teams on ESPN is as good as it will ever get. Why screw that up?