I'm aware that penetration is the main way to hack a computer, but basically, there is no virus hidden in some .exe, .rar, etc. files that could infect Mac OS, not that I know of at least. And penetration, or at least hacking tools are all available on Linux systems, so these should be the most protected ones (e.g. UNIX based systems). Lately (in months), some security holes have been exposed to everyone on Mac OS, but I think most of those have been fixed. I do not deny that other computers have many more possibilities of upgrade, and maybe of features in Windows (features are quite more easily accessible), the computer I had before my Macbook was pretty much more powerful than it (it was more then one year old when I changed), and nowadays, computers have gone very far in power, capacity, etc. In this, if you do not mind size, computers ARE better than any Mac computer, indeed.
That trackpad is convenient when you do not (want to) use a mouse, the trackpad on laptops (except if you make it very sensitive) makes it very hard/long to scroll from one end to another of the screen, so if you're clicking on some link at the bottom of the screen for then pushing the "previous" button, it is quite a pain... Wanting to display the desktop at once, showing all the windows opened, etc. Thus the three-finger move of the trackpad, etc. Of course, if you always use a mouse and have space to move it, it may be useless...
As of the store, it may be because it was the first Apple store in France, but friends of mine told me the "case" on their old white plastic macbook was replaced because it was dirty for one, breached for another, and the keyboard was changed for another one because it was missing some keys, all for free (and one of them had his iPhone's plastic-cover replaced also for free because it had a breach, near the silent button). But when I went there for them to look at my comp (the magnets in the screen have, I think, broken as it has fallen several times on the ground, nothing very serious, it still closes well, but is just not at the same level on one side), I have been told it would not be interesting to repair it, since it would be 400€ for replacing the screen (apparently it cannot be only opened to replace the magnets), which may be the cost of such a screen...
Maybe is it because it has been a while since I searched for hackintosh, but back then it was illegal, and I do not think things may have evolved this way, since Apple is attached to their property over their products. Moreover, people cannot install it freely, as there are some drivers required for all the hardware available (that may be the illegal part, modifying their OS/DVD for having some drivers integrated). Maybe it is time to read the whole agreement licence of Mac OSX xD
So now that many points have been cleared (not that I try to cut you in the discussion, but I think we have reached some point where everything is clear and there is no point in going further), maybe we could go back to the topic