#1 is a rugged kb suitable for vehicle, public access, possibly even military. Such markets commonly have super expensive keyboards. there's also a lot of expensive testing that the company has to recoup, etc.
I would contrast to a usmicroproducts kb, which costs a little less, and has cherry switches and metal keycaps. I want to get one eventually.
They are also a lot cheaper on the used market. Look at those pictures!!!
http://www.ebay.com/itm/201093715512#2 looks like a g84 kb to me. not sure what's up with that.