largely unimpressive, i have a friend who just built his own (pc) 16 core, 32gb RAM, 256 solid state, 2 1tb HDD's for 5000. apple is lucky to have OSX or i would have switched back by now
I know of people who have built their own cars. They used a VW chassis as a base, the finished article was faster and more fuel efficient than the equivalent model sold by VW, guess which one I, (and I suspect you), would prefer.
It's not all about cost. Price may be a major factor but it isn't everything.
Again look at VW, they own Bentley. Guess where the
vast majority of the parts for a Bentley are sourced, that's right the
standard VW parts bin. This doesn't blunt the appeal or price of the finished article, and that's the point. The finished article. My Mac not only does what those same specced PC's will do but it looks and feels nice at the same time so I didn't mind paying the premium for that. This makes a difference to some.
If being ripped off really made a difference to most windows users, (which it doesn't really), they'd all build their own, or get a friend/relative/colleague to do it for them. They would also never buy anything branded again.
I've changed jobs recently and even for goods that are not considered premium I've discovered that the mark ups are just phenomenal - we are all being ripped off. All companies will charge what they think the market will bear. HP et al are no different from Apple in this respect.