It's actually very simple,
1st NCwest should remove very long ago only the Prestige Rune, but not the Pack and denominate the adena deleting "000" (1k) from all NPC prices and players Inventory/WH/AH. In that way the accumulated adena for each and every server would be less and players can trade items instead of 1T for 1b adena. Ofcz, items in Grocery or drop adena from mobs which are equal to 1000 or less, should be rounded to 1 adena.
2nd NCwest should "flood" the servers with items during event promos, but NOT expensive promos. E.g. instead of the standard pack 50 usd/eur = 4k NC to reduce the price to 10 usd/eur = 4k NC. In that way more ppl will buy those "affordable packs" causing rare items reduction and making their customers/players happy. In order to reduce the very expensive rare items, all success rates % (enchanting, compound) must be increased.
3rd NCwest should make more "burn-adena events", such as "dolls' event", so players to achieve top items easily and spend adena at the same time.