Well, all those trucks take up most of an acre or more, along with the rental cars. The trucks need a flat, level surface. I'm pretty sure the networks want it paved (so they don't settle if the ground gets soggy), so there have to be adequate grounding points. I think they also prefer to be outside the track; it makes coming and going a lot easier along with food and fuel deliveries, Port-A servicing, etc.; but they want it as close to the tunnel as possible so the talent doesn't have too far to walk to the infield. They want a fence around all that to control access.
They need clear lines of sight to the satellites. They prefer to mount the cameras on fixed positions; it reduces the number of crane rented. Ditto if there's already power and communications to those mounting places; those save on transporting the necessary cables and (horrors!!) the labor costs to deploy and recover them. They'd prefer to have either reliable cellular service or for the track to dedicate a WiFi network to them. If they have to bring in their own temporary tower, that's more bucks.
They'd like adequate hotels as close as possible. Chopper access eliminates sitting in traffic getting in and out.
That's off the top of my head, based on experience relocating military headquarters in the field. No, Eldora may not have had all of those, but many of the less developed tracks mentioned don't have Tony Stewart making the pitch.