There is only one currency. do need some other currencies? maybe a new crate for them? maybe even a currency exchange? well, maybe a way to generate money offline? some sort of 'bitcoin/cryptocurrency' type thing would be good. it could possibly be used to purchase crates or better armour? maybe gc could make it so you could get a currency like Tokens of Protection that you can make for 1 piece of fully repaired p4 unbreaking 3 armour then cash it in for p5/6? sorry for how sloppy this is. I apologise, and I just felt like making a suggestion.
We currently don't need another currency or a token system, and the crates for in-game money will ruin the economy, disagree.
I think that what you have said is a bit strange, as simply adding crates for in game money would allow IRL traders to do less work trying to get a deal, for simply a bit more money. also, I only wandered whether another way to get better armor (rather than crates) is going to make PVP more interesting. also, the currency could just simply be a conversion based thing. EG: Buy the currency one day, and each day, the price goes down and up for it in the currency exchange. hopefully this has made you reconsider.