If I'm going to by a computer I want to be able to choose what OS I want on it. I want to be able to choose if I would like to pay 120€ more for a computer only because it's Windows on it, I want to be able to choose if I want to pay the double price because its Mac on it, I want to be able to choose if I only want to pay for the computer and have Linux on it.
Freedom is good. If I'm going to buy a car I can choose brand. It ain't that obvious when buying a computer. If I want a Mac I can...