I have another theory. Being a tech. I know for sure that Chrysler is by far the hardest (always has been since the mid 90's) to obtain data from both their modules and their factory (engineering/programming) information. They are always the last to let go of this info and it took government legislation to do so - up to a point. When ford and gm release anything you may want to look at on a scanner or on your pc, chrysler only gives you 75% of it and the other 25% is a secret and hard to get.
My guess is the company's that design and build aftermarket performance parts (mainly the electronics) have a harder time doing so thus the higher cost to us. Just a guess though.

When I compare cost (dealer) between the vehicle mfg., for the same product I cannot find any way to back up the above statement. A superchips, diablosport, etc programmer (same with exhausts, did not compare intakes there are too many options) costs the same for each make of the same year.

Maybe cuz the programs do more for power for cummins motors than fords..

see vid. LOL! J/K!
http://www.youtube.com/watch?v=Ibhf8F_bX1A

As much as I'm a dodge/cummins man, the ford bashing is done.