If someone asked me why I bought it, I wouldn't even waste my time with the technical stuff. "Because I've used both (Windows and Mac) and I like this one better". End of story.
I don't justify the style of shoes I'm wearing, or the color of my shirt, or what I chose to eat for lunch. Answer is the same in all cases "Because I like it". "If you don't like it, fine, who cares, buy something else then".
Dollar cost is irrelevant. You can get a cheap Honda that gets you from point A to point B for very little money. It will be reliable, and will work just fine. But to some people, who appreciate quality engineering and design, and attention to detail, it's worth paying more for the Mercedes or the Porsche.