That wouldn't work in Norway, anyway. You can only drive a car on foreign plates for a certain amount of time here. If you want Norwegian plates you gotta fork up the cash. For a brand new car the taxes are usually significantly higher than the cost of the car.
There is a progressive tax reduction for every year the car has been used, and the sweetspot is for cars that are a few years old. The asking price has gone down significantly, and the taxes are reduced enough so that it usually nets a 'profit' versus vuying a used car here. But the extra hassle of importing yourself, and no warranty claims means most people don't go that route. We are so used to paying ridiculous amounts of money for cars we don't think about it much anymore.
Heavy, powerful cars with large capacity engines are the worst. I once checked the price of an Audi S6 in Canada versus here, and the difference was 5:1!