What would you rather have real racing or gas left in the tank?
The fans want to see exciting racing to determine the victor, not who has the most droplets of gas left in the tank.
quote from:
http://blog.masslive.com/racinwithjason/2012/07/auto_racing_hot_topics_mandatory_late-race_cautions_in_nascar_austin_dillon_in_no_3_scott_dixons_eng.html