The market for long hood models is in crazy price regions and not many good offerings are available. Therefore the short hoods are consequently rising. Especially the Turbo short hoods (I personally don't like Turbo Porsches) show a dramatic price development.
Have a look at the first two offers by a serious dealer from Monterey:
http://www.mohrimports.com/view_inventory.php?make_id=16Until end of last year I bought short hoods (natural aspirated) from California for restore. Now, most US-price tags have superseded German price tags in addition to the weakness of the €.
On the other hand, David, do you think the people pay the price for the blue Turbo you showed? I think yes, The UK has relatively low Porsche prices in comparison.