I have used Nikons for many years professionally. Never abused, but in the press they did work hard. However since digital, things changed.
A D2X is still with me, but with a very low shutter count. less than 10k the D100 I bought lasted well, but no vast amount of clicks. Even in my press days I rarely used the motor drive, it being there so I could shoot rapidly if required while keeping eye to the finder for that special moment. Many these days use the scattergun approach. I like to think about my pictures given the time and then take only possibly two shots. So my D300 died at less than 75k never hard used. Another D300 had the dreaded mirror problems end that died again at less than 75K both less than half the life expectancy. I bought a D5200 at the time to keep me going as a spare. That was returned when it was discovered the images were not sharp. I tested the camera with 8 different lenses and all were unsharp. That camera went back and forward to Nikon in UK about 6 times. Each time returned working. Each time worse than previously. That took over a year. I was going to sue them. They sent me a D7100 for all my trouble two d300's and a D5200 and a year battling. the secondary memory card slot in the D7100 went within 3 weeks.Its been that way ever since.
Now I do not overuse, abuse cameras. I asked about the D300's I was told to send them in and they were sure they could "resolve" the matter. That ended up with Nikon sending me estimates for very high amounts for repairs. Getting several quotes from independent repair companies I discovered they could do the work for 1/5th of the Nikon price. then Nikon reduced the price by 50% still higher than any other quote. I am disgusted with Nikon and looking around on the internet it seems I am not the only one. So far my research has revealed may who's cameras do not even reach the halfway estimated shutter counts. So I am wondering if that is even legal? Do we expect a car engine to die at 75,000 miles ? No. so what a camera. And why do old film cameras ( like many of mine ) still work after 40, years? Do Nikon install an age limit?