From what I know, Cash Items can be sent to as Gifts to other Players if you know the server and ingame name. When the Gift it sent, the next time that player logs in, you will see a Gift card on your screen. You open it and you will get whatever the item was.
Unless there is something else I don't know, I think this is how its done.
LindaFay:
velocity7:
LindaFay:Why sell the card if you can just sell the item in game? :S
Can Cash Shop items take a form in-game as part of your inventory?
Yes, I think most can.
Wait, you are referring to the items from the Advanced Item Service? If so you can sell those ingame, the others can't. Correct me if I am wrong.