The problem is racing cars have constantly burnt out tires, while graphics cards have electromigration and total errosion of GPU long term 
Not in the useful mining lifetime of the card.
For a proper analogy, I'd equate worn tires to a burnt out fan, and electromigration to a blown engine.
Great analogy
But if any "parts" in the actual engine break then you're doomed.Anyways it's much better for me because I wouldn't gain much and it helps keep the temperatures low and my power consumption down.