Most of the regular (as in non-tech) people I know even though they like Macs (because they are beautiful) don't buy them (even if they have the money) because they don't think they're worth it. The people that do buy them are the ones that already bought into the Mac eco system, mainly because of the iPhone.
About the technical aspects you listed, I think most of them are debatable. But I do believe that none of them are the driving factors that explain why people but these computers.
What I don't understand is why we, technical people, are afraid to admit that we are also vulnerable to the extremely effective marketing campaigns of Apple.
You wanna talk about quality? I spilled a full cup of hot tea TWICE on my lenovo, and nothing happened. It turned off because it has a circuit that closes when it gets wet (to protect itself) but other than letting it dry, the computer is working just fine (I don't put sugar in my tea :) ). I dare you to try that in your new Macbook!