It is a grey PS4, that's it, the only reason people want it so badly is because Sony made it and said "OMG LIMITED EDITION".
It's kind of sad to see all of the fever pitch over it resulting in ridiculous prices. For a grey PS4.
The only reason a vast majority of people wanted it (from what I see in the UK anyway) was to flip it straight away on eBay.
I don't know why I'm justifying myself here, but I wanted one because it represents a piece of gaming history, I'm a massive Playstation fan and have been since December 1995 when my mum surprised me with one for Christmas after saying she couldn't afford one.
They are a limited production run of 12,300 in the whole world, I'm going to say that this will always hold some value if I was to sell it in the years ahead (I'm not going to use the joypad) as I don't want that to get tatty.