The auction figure never travels
It is a real price from a real transaction with a real buyer, and it stops at the skipper.
The settlement is a subtraction and a division. Both inputs are known to the owner and neither is known to the crew.
It is a real price from a real transaction with a real buyer, and it stops at the skipper.
Fuel, ice and provisions are tallied when the trip ends, from receipts the crew never see.
Everyone remembers the arrangement slightly differently, and the differences only matter when the catch was poor.
Questioning the settlement risks the next trip, and there is no document to point at anyway.
Being designed, nothing to join. The useful thing is how a settlement actually runs where you are, and what the last argument was about.