It is new. Would you say the something about a new Honda or Toyota you are picking up at the dealership? "I don't mind that dent and scratch. It is only a $25k car after all. First world problems."
Not really the same thing. At the dealership, it's your responsibility to look over the car you are buying. Hopefully take a test drive in it. Make sure it is to your satisfaction. With this computer, if mine shows up that way, I might report it, as others have suggested, so that Apple can track quality control issues. However, for a blemish that small, no, I wouldn't ask for, or accept a discount. I feel the same way about the minor scratch that was posted earlier. It was on the back, where it would likely rarely, if ever be seen. It has no impact on the function of the computer.
Besides, with cars, you are supposed to haggle over the price. Last I heard, only Saturns, now discontinued, had a no haggle price structure. For a car with a minor dent, I'd have them knock of a grand. After all, it's the car buyer's job to get as close to invoice pricing as possible, and the salesman's job to screw you as much as they can while still getting you to buy the car.