99% of racing is advertisement for the brand as a whole, not for the specific model. Yes, they can try to push a specific model with the car they're racing, but it's more aligned for everything in their lineup.
For example, you've got a Holden supporter who's out looking for their first new car, and while a Commodore might be out of their budget, they'll still go down to the Holden dealer and pick up say, a Cruze, Astra, or Spark because they support the brand.
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