Why not put a nice piece of armor or a weapon there instead of deco. Also limiting the number of staff items that you can get in a time period would be good ( 3-6 months). This way Roc wouldn't get them all goodies. Just messing with you :P
I think how it is set is fine enough. I do not get all the stuff items, as I know it I have only one or two since I have been here.