Sgt Culpepper - I don't have the figures for JFK (largely because I never looked at flying there) but I do have the ones for LAX. And believe me, they do compete - TBIT vs Terminal 2 is a good comparison.
TBIT charge per turn for an L15: US$5,873
TBIT charge per pax for an L15: US$29.22
T2 charge per turn for an L15: US$4,818
T2 charge per pax for an L15: US$3.76
In any case, as I understand it, Mary O'Rourke has stated quite categorically that the new terminal at DUB is to be privately owned and operated.