For a practical example look to the introduction of the EC155 to Nigeria; there never was going to be an engine failure because no engine sat in the aircraft for more than 200 hrs.
Get your point and, except for the poor example,very well put.....
Nigeria is not the only place the EC155 was introduced and it has been more successful (with much longer engine 'sitting' times) in those places. So there was still the probability of an engine failure with that aircraft/ engine type, just not in Nigeria.