Conflict of interest I'd assume. They do have that segment where they "pick" their drivers, but lets be honest here. They pick the best runners for the day and even then, you don't ever hear them "root" for them, so it's completely and utterly pointless. So, i feel right now, while they may have a favorite driver, for the most part, they don't openly express it. They just really love to kiss the butt of a driver who has been dominate all year and can't seem to stop talking about them (plus jeff gordon's love for chase elliot).
This was particularly annoying when all they could talk about was Kyle Busch after he won the championship. In my opinion, he should have never been allowed to make the chase. Miss half the season and you're still given the ok? How is that fair to the rest of the competition. Anyways, different conversation.
The broadcast team is already annoying as is. Do you really want to hear them talk about a Fox/NBC car all day?