Good analysis, elvis. I agree with almost everything, but I think trim is much more expensive than you think. Have you taken apart your dash? In a lux car, there are many layers of plastic, metal, foam, etc. and they are held on with many more fixtures. Plus there are much lower tolerances for errors in fit and finish. When parts are manufactured to tighter specs, the price goes up exponentially.
"struan87 you are way better than Google!" --BCole
Pictures.