Hiya!
Well, for my Zombacalypse! RPG I'm working on (totally different rules; using Masterbook RPG), I'm using the "currency" of the State of Decay (1 and 2) which is in the form of a non-physical "Influence". You can 'sell' items you scavenge for Influence. These points accrue and you can use them to 'buy' stuff from traders. You can also use them to get favours, tasks, and other such things from others.
Anyway, the "semi-religious order" that your PC's belong to may be able to do the same sort of thing. The PC's recover the GP's, SP's, Gems, and other treasures and turn them in to their commander/high-priest/church. The PC's keep a running total of this...maybe as a 'group' in stead of individually? At any rate, they can then ask for "stuff and favours" from anyone who abides by the 'churches' laws and whatnot.
That would keep the idea of "getting gold" (a D&D trope), as well as a churches unsatiable desire for material wealth (despite them claiming that the "material world is a distraction")...while at the same time removing the coin-counting from the players side of thing AND reinforcing their devotion, trust and allegiance to their "order". When/if the PC's ever get the opportunity to retire, they can then draw from the churches coffers, so to speak, and go buy a farm or whatever.
^_^
Paul L. Ming