AnFI,
about your
In the same way we should quantify where the threshold is. It certainly is not 20 to 1, you say it is 20 to 15 ... the threshold is somewhere, and a little logic and maths can help us find 'the right answer', it is not an absolute.
I have to admit that you are very clever to ridicule my thoughts.
So let me explain the rationale behind my example
15 Pax vs 20 shows that flying PC1 with a medium helicopters, like those operated in the North Sea, does not increase significantly the number of flights: 4 flights instead of 3 for moving 60 pax. The increment is 1 over 3 equal to 33%.
While in your example, 2 pax vs 6, applicable to a B206, the increment is 2 flights over 1 equal to 200%.
So I was not playing with numbers but only trying to demonstrate that
"no exposure" does not increase dramatically the operational costs if you compare with the costs , in human life and economic, associated with a potential accident.