I have one non-tech-savvy friend who just holds his laptop's power button down for 5 seconds when he's done using it. "Oh yeah, it's great, it shuts down properly and instantly and I never lose any data!" I had to emphatically explain to him that he was effectively playing Russian roulette with his life's work. This is just an anecdote, but while anecdotes cannot set averages, they can be used to find a lower bound on extremes.
