In here you can join a random event room filled with end-game players, just leech there, I don't think they'll mind it. As for in-game currency, I believe you should be patience with it, grind the event zone for its locked crates, and then sell it. Or buy the platinum, they're on sale every time during events. You can use the platinum to buy crate keys from the vendor that usually pops up from the mobs on the event zone map.
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