I have been using the same computer for 8 years- we have never had ONE problem. I also use pc's when I have no other choice, and I'm very familiar with them, but would never choose to buy one. The price of macs is so worth it. I've seen my entire family go through at least two computers to my one- some have had three. All have had to take their computers to a shop for de-bugging, new motherboards, whatever. Always problems of some sort.
Macs can do all the same things that pc's do, usually with fewer clicks to get there. Macs will even run windows if you really want them to, I've never had the need, so I don't.
I don't run any type of virus protection- I download from email, music, video, anything, without fear of viruses. I also don't get pop-ups.
For something like a computer, it's so worth it to spend the extra money, take a bit of time to get to know the mac OS. I would be livid if I spent the money on a computer, only to have to deal with viruses, and all the other problems that come with owning a pc.
Oh- I also spend more on cars, to avoid similar problems. It's just worth it to me to not have my car breaking down often.