NEON, Remember that part of the increased cost is due to the fact that the $ has lost so much of it's value between the start and now. Also that higher figure includes not JUST the plane on the runway, but also spare parts, maintanance systems development and training and continuing R&D programs.
I used to think the same way, but my Mother was a civilian AF employee involved in QC systems. She used the $600 Coffee maker as an example. Mr. Coffee is $20, but the one the AF needed had to fit a particular free space in a given A/C, had to be Stainless steel, had to work at 40,000ft, there would only be 10 made, and a bunch of other details that could not be met by a standard coffee maker, each one drives up R&D costs and eventual unit price.