As all of you probably know, the economy in most fantasy worlds i a bit wonky. No, really! What I mean is that even though there are more precious metals than just gold, all the prices are in gold and it is what everything is compared to.
Those who like to get away from the gold inflation usually turn to a silver standard instead. But, I think this just postpones the problem. After a bit longer you will once again find that rich enough adventurers just ignore those piles of silver and copper and whatnot. Weight compared to value is not good enough.
I remember when I played D&D 4, that I felt that when we got the spoils in gold, it was always a bit of a let down. Somehow the sword and sorcery trained mind of me wanted heaps of gold and fistfuls of jewels, to be squandered on wine and women until the next adventure, of course.
Could you maybe have both?
How about you bring back the rule that gaining a level takes training? I mean the kind you have to pay for. In gold.
So what? Well, bear with me. Imagine a silver standard. Now, imagine the idea that nobody do silver for gold exchange.
Why? Well. I haven't figured that out yet. But, imagine you finding a chest filled with thousands of silvers. Back in town you repair your armour (you do use the rules for ablative armour, don't you?) and throw a feast for everyone in the tavern. Fun is had by everyone. Next time you go on adventuring you are broke, but manage to find a few ancient coins in gold. Now you can actually train and use those XP you have gotten on your last three hauls bringing up thousands of silvers, spent on carousing (you do use Jeff Rients carousing table, don't you?).
If you figure out a in world rationale for the set up above, let me know. I like the idea, though.