There is no such thing as a premium market. That is something made up by Apple fanboys to justify that Apple has never broken into double digits in the PC arena.
Apple creates and arena and will only play in that arena. If they were that proud of their OS and felt that could support the many hardware options MS supports they would have done it a long time ago. Fact is they can't.
Its not that hard to have the #1 rating in customer service when you are only supporting 9% of the market and have a handful of hardware options.
Premium market my Velocity mirco system cost more then two 27" iMacs. Apple uses the same hardware as everyone else there isn't anything Premium in their hardware, that is a myth that people like you have talked themselves into believing.
90%(sic) of a moribund market, or increasing dominance of the market of the future (mobile internet), and growing. MS dominance of the desktop is due to entrenched monopoly and corporate entrenchment. They have no battle plan to counter the Apple ecosystem and they're scared shitless.
I know which one my money is on.