The price is high considering any company wanting to make these, do so off a nice door to begin with.
The OEM Alloy door is roughly $100 at the dealer. From there, you do the overlay on the door piece with the CF (time/material), then add other overhead expenses, shipping, etc. So I can see where the price is 175-200. My estimate to make one of these for the 3G is $195, which is VERY close to where you found your price from.