Here's a fun exersize -read through what Mendicant/NoblesseChevaleresque has to say, but replace "Aurvandil" with "North Korea" and "Mendicant" with "Kim Jong Un", and "Nobles" with "Communist Party".
The Eternal Treasury is kept and maintained by Sarit after all, the Royal Purser simply fills out the forms. The courts and the Communist Party decide verdicts and Kim Jong Un passes judgement, the Arbiter of Justice merely enforces the punishment and ruling he is told to enforce. They cannot be politicians in this system, nor can they serve themselves by being placed in these positions, they can only serve Kim Jong Un and the People's Republic of North Korea.