ORIGINAL: Propworn
I think your figures are somewhat out of whack. The models that fly at the Lockheed Martin sponsored Aerodesign competition are built to fly under extreme conditions by rank amateurs often using 1000 or less mA.
RC Flyer and several other publications have had articles that post graphs showing draw rates of servos under load.
While often total draw remains pretty low, pushing the limits can over tax the battery packs quite easily. The rather scientific methodology used in those articles bares that all out.
You can try it yourself, by putting a resistive load on the control surface or three ( push it in the other direction ) while you have a watt meter connected.