NASA does run full circuit there sometimes, there was a 4.5hr twilight-to-night enduro there on Friday whole course (north and south loops connected for 3.56miles).
Autobahn rents out the south circuit for events and full course is available only on mondays usually for rental.
Members get to use the north course whenever they want (except Mondays) and the south whenever it s not being rented.
Considering ABCC is a country club, that's a helluva deal for renters. The South track is 2.1 miles and the North one is only 1.46 miles and less technical and fun. Other country clubs don't even lend themselves for renting AT ALL. Monticello in Upstate NY is an example of that as of last year
it doesn't seem AT ALL like you're being robbed by running the more fun configuration of a 2-part track and pretty much everyone who has been there that I have asked said the same thing