I was a pro stock motorcycle sponsor for years. We were not allowed midway space in our program. We had to pay out a minimum of $1250 per year. If we paid out less, we has to give the difference to NHRA at the end of the season. As Dave Schultz, John Meyers, and Angelle all carried my sticker, I never had to pay NHRA anything. That minimum was a great thing. That kept people out who had a product that no one used and wouldn't have to pay out, from getting a free ride all season.
I might add that we got 3 event passes for every event that ran PSB. We gave those away as rewards to customers for dealing with us.
We only quit when it became an all Harley® thing and we would have had to pay NHRA at the end of the season.