Good grief, let the drivers sell their shirts. If that is the worry of being profitable over shirt sales then....well...hmm. I don't want to have to go to the pits to buy a shirt, if there is oil or grease with in a 100 yards I will step in it and track it in the car, every time.
I usually try to buy several shirts from all that has them. Make it easy to be a fan and show support.
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