I get what you are saying on all this...and I do agree to a point. Apple doesn't have to run the company by marketshare alone and of course marketshare itself is not the way to run a company.
But alas, until Apple starts offering some Macs that are cheaper, the friends/family/co-workers I know will not be buying Mac. Just as your rolex watch example where all watches do the same thing, most of these people want to "do the same thing" on a Mac just like they do on their pc...surf, email, photography, word processing, pay bills, etc. And to them, it's alllll the same stuff (and it's true especially since everything is web driven these days and you can use Firefox and Safari and IE cross platform...so it all acts and looks the same). So to them...for their use cases...the average Joe...why spend 2-3x more on a Mac when they can get a pc (just like spending 2-3x more for a watch or a tv or desk lamp?) And no, I don't wanna go down all the perceptions/reasons of why a Mac is better than a pc.