I agree. I don't see the point of putting them on hand luggage that will never be checked.
It seems to often be the DYKWIA types that rush to priority board and end up sitting down the back.
+1. The crew know your status. You know your status. The lounge staff known your status. Why would you care if a stranger knew your status?
As an aside, I don't use them on my checked luggage either: I'd rather use a generic, non-standing out kind of form of identification. Call me paranoid if you like, but I can't see that there can be anything good that comes from unduly advertising status Having been to countries where luggage has a tendency to never arrive if it looks interesting, I'd rather keep my luggage as boring as I can.