Before you can state that priests should be able to run around with large amounts of gold, you should ask yourself why bandits were put in place in the first place.
The ability to courier large amounts of gold around the map at little to no risk is not something to be desired. (Just think about it. If it was intended, then they wouldn't have bandits in the first place to prevent/discourage it.) Nobles traveling with units can be attacked, imprisoned, and have their gold stolen. Priests... cannot. So if you want the ability for priests to be able to carry around massive amounts of gold, then it's up to you to justify why that particular class should have a function which it was never intended to have, and only had because no one ever bothered to implement attacks to prevent it. It's presence was unintentional, and taking it away is not removing a feature/function.
Why should the ability to courier large amounts of gold around the map be *added* to the game? I suggest that if you want it added, that you file a Feature Request to do it.
