must have hit a nerve with my post.
Its true that machines will break, but if they are being sold as in your words with high quality parts then the need to purchase an additional warranty for the life of the machine (I class a pc lifespan as 3 years) should not really be needed if its only used for normal use. Obviously if its used in a way that is outside of a normal user then its going to fail quicker, all products have tolerances that need to be adhered to for optimal lifespan.
Yes you are always going to have a percentage fail but is it fair that we should pay for the additional warranty on a 'premium' product because of the defects from faulty hardware that were supplied to the user.
Cars are now being sold with 7 year warranties, plenty of other electronic devices come with greater than 1 year warranty, if apple believed in the quality of their machines then they would offer the 3 year warranty as part of the product (atleast on the pro range).
Hell I've got a tft panel thats about 8 year old and apart from the psu block failing after about 6 years it is still working just as well as when I first got it, and that's with it being transported up and down the country for several years too while I was at uni!.