That just goes back to the compromise argument.
Nissan could change the 370Z's specs a bit and sell it as an awesome track-only car. Strip the interior, drop the power windows, power door locks, radio, etc. Give it an oil cooler and a factory roll cage, etc. You'd probably come out about even on mfg cost changes and it would be a great track car. But then it would never be worth it on the market: not enough of them would be sold because it'd be a horrible daily driver for a commuter, so they couldn't really afford to produce them that way in the big picture. The increased sales for track drivers would never make up for the loss of regular consumers who just like the look and sound and feel of it and want a "sporty" daily driver.
So they make compromises. The idea is to put out a track-capable car that's still cheap to buy, just barely commuter-friendly enough to keep the sales volume high enough to keep the car around, and only needs a few key mods to be ready for amateur track use.
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