What Kinah buys
Kinah, Kina in NC's global client, is Aion 2's everyday currency. Enhancing gear costs Kinah you never get back, even though the stones come back on extraction, and the bill grows with your gear. It also buys the materials, drops and crafts other players sell on the Auction House.
How the market works
Every server has its own market, and Kinah stays on the server you earn it on. NC plans a cross-server market later. On a new server there's little Kinah in circulation, so the first materials sell high and the players with Kinah set the pace.
Why buy
Earning it means daily duty quests, dungeon reward cubes, a gathering or crafting line and selling drops, day after day. Buying lets you enhance and shop now, while the materials you need are still on the market.