Are you seriously tipping concierge lounge attendants? Even tipping housekeeping is unnecessary and debatable even here on FT.

And frankly, I don't see the point of putting a tip on your room charge. Isn't the point to thank the person personally for the service they provided you? Putting a generic amount on a room bill and having it distributed after the fact seems like tipping by rote and not the actual purpose of tipping.