I was in one draft where I was doing the Charge jb and was entitled to substitution pay, when asked why I wasn't claiming it the officer in question was amazed it was only 50p per day (before tax).Me too! Plus, at the time, the financial incentive was I think 50p a day and no pension differential. They actually had to virtually beg people to do it - not this c/s.
On one boat the inboard Cdr (E) and the MEO were in manouvering when the lack of CC's came up. The Cdr asked me why I wasn't interested and I said there was no point doing an extra 6 months course (to become an NCOW) then a years training on a boat to qualify in every position, followed by a three day board, just to go outside and get the same pension. The Cdr tried to tell me there was a pension differential and was genuinely stunned when one of the CC's present told him there wasn't.
That also summed up to me the level of some officers knowledge of the lower deck.