Fox had none because it makes all their races that much less "interesting" (depending on the year, they leave after the 17th or 18th race, long before the rush for the top 10/"400-point club" heats up). It's all NBC/TNT (did anyone mention that TNT runs NASCAR.com?).
These are the things that piss off drivers and cause them to form a "union". If that happens then there goes the uniqueness of Nascar Racing...
Or worse, gets the owners riled up enough to start their own series (does CART ring a bell?).