Porsches are overpriced on paper, but that doesn't stop them from posting big gains.
The main 'spec' that all these paper comparisons miss is the ones you can't see until you use it.
For example, lift up the new ENVY13 from HP and then compare that to an MBP13. It should be an immediate occurrence of which laptop is higher quality.
Apple also provides retail locations for warranty repairs, something that other manufacturers lack. No one likes to spend time on the phone waiting and explaining something they can do in person.
Apple laptops also have strong resale value, something that other laptops lack. My girlfriend just sold her 2007 Macbook for $730 on craigslist (Powercord with no box). Thats just ridiculous. It changes the cost to own immensely, which if you care about that topic, macs are actually far cheaper to own than PCs.