Personally I cannot justify spending that kind of money on a keyboard, but if that floats your boat, you can have one for under $200.
Also worth considering, Bing Lee 20% off eBay deal $199.20 C+C
Thanks to TA for the Original 20% off Computer Alliance on eBay Deal Post
I guess with things like the Surface dial and this very niche market Logitech wants an option…
If you do an Apple and price them high it makes them desirable for 'creative professionals' :)