I have found the concierge to be pretty worthless from a consumer standpoint. In my first trip in BF years ago, from reading the literature, I expected the concierge to get the BF pax and walk them through passport control as a group (that is what the literature says). I was surprised when the concierge did absolutely nothing. Seems to me that CO could make more use of the position. Apparently the concierge has quite a bit of power (more ability than GA or TA). I think they are there mostly to solve any problems that may arise.