I wondered the same and found this thread [1] - they are obviously priced based on the added value, i.e. reduced fuel consumption - and not on material and manu

I wondered the same and found this thread [1] - they are obviously priced based on the added value, i.e. reduced fuel consumption - and not on material and manufacturing costs. [1] http://www.airliners.net/aviation-forums/general_aviation/read.main/3089549/ http://www.airliners.net/aviation-forums/general_aviation/re...