Well it also depends what kind of windows running computer you have. but to be honest, even though it's expensive, at least the parts work, and with applecare, apple will replace everything that breaks, and with excellent customer service here in north america.
my personal experience is that my apple computer has held up much better than my old dell. the dell fell apart on me
through constant use and the macbook in comparison is still in one piece after almost 3 years.

the dell's hinge broke, the screen was coming apart because the screws fell out, the disk drive cover broke off, and the keys popped off... never had these problems with the macbook.
so, in my own opinion it's actually worth the investment.
it's also worth noting that I have not had problems with adware or viruses and any type of malware since switching, as I mentioned before.