when adena cap was 100b, i was one of few moving far above. used EWRs/BEWRs as deposit of wealth, price was around NPC price so could any time change them to adena if needed..
anyway i dont have PhD in economy
if you hit 1T adena cap, you can always change currency to R gems. 1m R gems = 1.26T adena.
or to any other rather more expensive item to make trades over adena limit.
i would sue ncwest for false advertising since nobody ever got lv2 boss jewels or dragon weapon. luckily i dont spend so i can just laugh at those abused