My D70 has been in use for close to 2 years and I have yet to send in for general servicing. Reason: too expensive to warrant a general servicing but rather it pays to do routine cleaning and maintenance rather than rely on that general servicing. Routine maintenance goes a long way for my case.
If you're a normal guy with a pro camera even worse! They charge you the pro list price to get the camera checked, not even servicing yet! I dont remember how much but its in the hundreds. If you have a pro film camera might as well get a new camera if it kaputs.