The data are fishy. Do they fail because people buy a netbook because they can take them more places, and thus have a higher incidence of failure because they're being carried and used in more places?
My own experience with a netbook vs laptop is that the Asus EEE PC I purchased nearly two years ago is still going strong without a single hardware issue, vs the cheap Dell that lasted a year before developing critical power issues (right after my warranty expired, of course) and the Fujitsu Lifebook likewise failing with hinge death at about a year and a half, after a long run of problems.
My Asus netbook seems to just be more rugged than your average PC. Also, I take the thing everywhere, where my last laptops were left home a lot more because they weighed so much more.