These may be silly questions - but why are these things so huge, and so expensive?
Eye-fi uses a wifi device that fits on an SD card and does not require its own batteries... Granted, these here need to perform somewhat more work - but piping commands from the wifi through to the USB port does not require an entire computer!
I stumbled over these because I was thinking about how to wirelessly control my DSLR, and before I found these two I was thinking that it should be possible to construct a device like that which is so small it might almost fit into the USB port itself (OK, not quite... but certainly not as large as this!). Where is my mistake?
And given these two - why not directly tethering the camera through a smartphone and use that as the wireless server? An old phone (apple or android) comes for way less than 300$ AND lets you play doodle jump! 
How much demand is there, anyway? From the amount of money that the makers of CameraMator could collect it seems there is quite some... What would you use it for?
PS - I did not find that... But can the 6D be controlled wirelessly?
1. it is not "huge" ... its a little bigger than a credit card, of course it is a lot thicker than a credit card.
2. Eye-Fi memory cards just cannot do anything close to what a CamRanger or a CamerMator can do
3. The thickness of the device is due to the rechargeable battery inside.
Regarding you question about "What would you use it for?" do a google or youtube search and you will know why
First of all I think I might have expressed myself badly - I am not at all criticising or questioning these things! I find them really cool! After all, I found them because I was thinking about how to build something like that. My question "What would you use it for" was not "what the hell is such a thing good for" but rather "what specific use do you readers have in mind for this". I did see some uses online, and I can imagine some myself (studio being one, wild life another, maybe sports - setting up multiple cameras at multiple positions? - architecture to get weird angles, time laps apps, whatever).
For the rest: huge is relative - the device is considerably bigger than I thought it would have to be. And my question was if anybody knew why. Of course, the footprint is a credit card, but in all it is big because, as you say, it has a large battery. That is why I compared it with the eye-fi - I am aware that they are different devices, but what they have in common is that they need a wifi, and they have some kind of chip inside that takes care of this. The eye-fi cards obviously have a tiny one (I believe it is around 2x2 mm^2) that barely consumes any power. That is how they can fit it inside an SD card. The same thing could be used to remote control a camera, except that it might have to have a bit more computer power behind it to translate things into camera-language. But even that I am not sure of.
If you get rid of the battery and the "large" computer you can basically size the thing just like an eye-fi (which uses a lot of space for the memory and the electrical contact), maybe a bit larger. But it is entirely possible that I am completely wrong, I am just asking...
