The Copper-Platinum system isn't necessary to gameplay, but is still kind of nice for the world immersion since we're built on settings where that is the finance. But practically everything in the game could just be some number of platinum.
The bigger issue is the lack of things worth buying, especially for veterans. The shard exchange is fine as it is, a system of real money for an exchangeable but not simple Tradable currency is reasonable, encourages us to keep paying for the product we use frequently. But what I would like to see if it doesn't exist yet is a form of Named Loot bounty system. Finding people to help us grind for gear can be hard since there isn't really much reward if you aren't getting something you need. But pay a certain amount of platinum per run, higher amount if they give you the item drop you wanted. More players pulling, more expensive but more likely to get the item. Need some money to pay for a few loot runs- do some runs for someone else. This is something the community cooouuulllld try to self regulate on Honor System.
"LFGear- Leg Light armor Crownblade- paying 10k plat/player/run, 500k for item".
"LFGear- buying sentient food passes- 50k/item passed"
8 runs to ransack, 5 potential bounty hunters, even if no one gets/passes the drop you're out 400k. Get the item and buy on very last run where everyone was there all 8 runs, you've spent under 1 million on something you otherwise couldn't have gotten unless someone was generous. And with end game randomly generated loot we don't have a reason to take and sell being in the ballpark of 2.5k/item before Haggle, we can easily recoup some Bounty payment by just running the quests and taking the trash to sell later as normally.
We basically turn each other into that platinum sink and we feel like we're getting something that we could then use to encourage others to help us later. An in game system would help to make sure people didn't get cheated out of promised payment, but there would need to be a real reason for the devs to devote time to making that for us. And it doesn't guarantee that people actually pass you the items and don't just walk away with your platinum. But at the end of the day, its Plat, what else are we spending it on but Wings and weirdly inflated auction items. It also helps solve the issue of not being able to buy/sell BTA/C items, but if we pay people to help us grind the gear they're incentivized to find a Buyer over just selling to a tavern for 1/100 what they could make selling to a player.
This could arguably create some amount of 'market value' for items that otherwise can't sell, and levels out some prices on the actual auction where people are asking a million for an item that doesn't feel worth 1/4 your maximum money. It would also be nice to have a Bounty system in the Auction tabs where you post what you're looking for, and anyone can put that item into the tab and receive the payment instead of the other way around looking to Sell
I definitely see where some people will immediately dislike a system that they normally engage in for free, and they are more than welcome to continue to do so without asking/negotiating a price to pass. Its just an idea to create that plat sink that incentivizes cooperative helpful player interaction. You do loot runs for others to make some plat to afford your own loot runs. Maybe not enough players would utilize it to justify an in game official system being made, but there shouldn't be harm in trying it individually and seeing how results go.