No, you cannot control costs within a class. If someone wants spend the GDP of Swaziland on building an IT car, they can do it. BUT, costs are effectively controlled. The marginal improvement for very expensive items is well within a single standard deviation of mean performance for the car.
Go ahead and have custom-designed, $500,000 shocks for a car... from the lap times, I doubt that anyone will be able to tell the difference between the $500K shock car and someone who doesn't. (At least from the lap times.)
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