As I understand it, Bernie is obliged to provide a show with a minimum of 20 cars to a race promoter in order to get his racing fee. Notwithstanding the FIA and Bernie allowing some teams to skip the races, the promoters haven't said they agree with this AFAIK.
So with less than 20 cars, do Austin and the remaining races (if Caterham and Marussia don't show up again) still have to pay? Or is Bernie the one not holding up his end of the bargain and therefore liable?