Glory Box: What Makes Your Edition Special?

I was just reading the VG247 story about someone getting hold of their Starcraft 2 collector's edition early, and then excitedly unpacking it all on video (and failing to get the game working because of the online aspect of it). The video's below the cut, but the growth of special editions across the last five years is an undeniable trend (For extra money! And you can't pirate a little key bobble in the shape of Shodan's head, natch). I was thinking about what - if anything - makes me throw down for the full bells and whistles version. I often don't, simply because I don't have room for the gargantuan boxes... but I like that they exist. So, to throw the question to the floor, what attracts you to these editions? Do you often buy them? What would you like to see them? And what games in history do you wish had one - and what would be in it?