Not quite the same. If you buy a car that advertises 23mpg, and it gets 22mpg, do you get to turn it in for a new one? No. Why? Because there's a certain fault tolerance.
Thats a different analogy. Effectively a stuck pixel is a just a little mark on the screen, it hasn't anything to do with the computer workings.
Were as if it was something such as a HD taking longer to boot up from, that directly affects the productivity of the computer.
I'm referring here to the productivity of the technology, not of the productivity of a person who works with photos etc, were pixels are an issue.