The price is the same as for the long tele F-mount lenses, and I haven't heard people commenting on it. And it is actually cheaper than the Sony A2218919A, HOOD BLOCK ASSY, SEL400F28GM, $1353.95
You will lose the bet, the carbon fiber hood, the locking system, the integrated rubber, is relatively expensive to make (molds are always going to cost the same independently of how many times they are used) , but obviously, if they were produced and sold in bigger numbers they would cost a fraction of the price. Nikon (Sony, Canon, etc.) will probably have them in stock for several years before they sell any, these things aren't easy to brake. Obviously, their margin in accessories for professional equipment is huge, but it's the same with any company. If one spends $14k in a lens and breaks or loses the hood, $1k doesn't seem that much, but if you buy mounting brackets for studio equipment or any professional accessory that is model and brand specific you end up feeling that you are paying 3-5 times what the accessory is worth (I learned that many years ago with Sony broadcasting equipment).