[kgroll]

Honest question: Are you basing that off personal experience, or is there evidence that this happens on a large scale?

To provide another data point, my Dell Latitude D520 still has all keys intact, and I've been using it roughly (in every sense of the word) every day since 2005. On the other hand, my HP notebook from work has already lost it's Shift key after just one year. (Maybe that's an indicator that I'm YELLING too much at the office...)

That's just an anecdote however. There's no way I would try to make claims about either keyboards based on that small sample size.