I'm thinking there's a few factors to weigh in. Some tracks have curfews so keeping the show moving for the cut off time and getting a good show for the fans so they aren't driving home in the early morning hours. The second is the added wear and tear on equipment. If they were 50 laps long, that's almost two races a night and that added wear and tear adds to higher operating costs for sure. Some of the cars run 40-50 shows per year @ 20-30 lap shows. There would be a lot of equipment failures if they ran 50 laps all the time. Just my .02.....
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