The simple reason: a reputable caving association has not put forward a coherent set of requirements and waited for the roughly five year process of comment, testing and revision.

Do not know about staff size, but guarantee that fundraising is a factor. 

I have heard from inside sources, that 2 large factors in Scout Executive pay are fundraising results and size of staff they manage. This creates a perfect self-fulfilling prophecy. You have to hire more people to fundraise the money that you want. Then when you fundraise enough, you can hire even more people. Then those people can go fundraise even more which repeats the cycle. Unfortunately, this cycle will break down, it is just a question which link breaks first.

Our Council got pretty tight about that stuff. They tried to hang some of our adults out to dry for having a multiple unit campout, (just like we had been having for YEARS) without the Council permission. They went right down the YPT route and accused leaders of violating YPT policies for something that NONE of us knew existed. They even used it as part of the grounds for why they revoked a member's registration. No incidents happened, they just wanted to prove a point that they could do that. Then they started getting pushback from others and they started doing "awareness" in the Council to make sure people knew about it. How convenient they left out the fact they used that as grounds to dismiss a member. 

It has been announced as discontinued in Scoutbook, I believe.