Who buys a computer without a warranty that covers it's expected usage period?
Businesses. Companies that buy a lot of laptops don't like to send them out for a lot of warrantee repairs, especially for minor things (like replacing the keyboard, battery, or a hard drive. It is difficult and expensive. Why? For starters, most companies that care about security require removing or wiping the hard drive before the machine leaves the control of company personnel. If the hard drive can't be removed easily, or is some kind of custom thing that only works in this one model, that can be a real problem when you need to wipe it and the machine won't boot.
If a thing's worth having, it's worth cheating for. -- W.C. Fields