The cost-sharing regulation can only achieve its explicitly stated purpose if your suggested test isn't applied.
I understand your point and, as you can see from my other posts here, I am very much in favour of genuine cost sharing. But (
), at the same time as encouraging pilots to fly more, we still need to stop phoney "taxi service" operators from abusing the rules.
My suggested test seemed a sensible way of achieving that, although I'm happy to listen to other ways of achieving those twin objectives.