Collector cameras often bring a lot more if sold with an original box. An SP with f/1.1 Nikkor would be worth huge bucks anyway... and even huger bucks with the correct box. So this might actually be a good investment for someone who already owns an SP/1.1 and wants to maximize his return when sellling it. Also, think how few of these boxes were made, and how few must have survived! It may be years before there's another one for sale.
Also... speaking as someone who designs boxes for a living (seriously!) I have to say the design of this box is extremely cool. The proportions, colors, and use of white space and typography exemplify some of the best trends in modern late-1950s design.
It would be interesting to put together an exhibit of the evolution of the boxes of premium 35mm cameras: going from the early ones, which seem to have been influenced by the design of jewelry boxes (appropriate for selling a small "precious" object) to the best ones from the '50s, like this Nikon box (designed to convey the image that you've just bought a bold, modern product) through the rather boring foam-brick era of the '70s (when it seems the idea was just to provide the necessary protection as inexpensively as possible) and on to today (I'd nominate the package-as-theater concept of the Epson R-D 1, designed with contrasting layers so that opening it for the first time is a dramatic experience.)
What's really interesting about camera packaging (to me; okay, so I'm a package nerd) is that normally when buying an expensive camera, you don't even SEE the package until you've already bought it. So, unlike for many retail products, spending a lot of money or effort on the package can't be justified in terms of on-shelf sales appeal. And yet, companies DO spend a lot of money and effort on them. I can only surmise that either this is motivated by sheer pride, or by the assumption that it helps give the new owner a stronger bond with the brand.
See? Being interested in camera boxes isn't so crazy. I'd collect them if I had the space... although I doubt if I'd ever collect many $1,500 ones!