I see your point Bob with the added labor and such. Your post makes sense, not trying to step on toes.
I do everything on my car myself, so I was just looking at it from the "price of the part" stand point. For example, all the Chevy aftermarket intake manifolds, heads, water pumps, etc, are cheaper than the comparable Mopar parts...more than likely due to supply and demand only (if you can mass-produce it, it gets cheaper).