Neat idea, but I think (certainly not) the only way you'll ever see a substantial return is if you were you marketing this to the obviously most vile demographic of pornographer(s) out there.
I think pornography is definitely the main market here. However, it's doesn't have to be child porn, as you imply. I think there's a housewife market. I think a lot of normal people would record more (ahem) adventurous videos, if there was a guarantee that those videos couldn't possibly, EVER, be seen by other people.
If it takes $6K to convince the wife to break out the whips for the camera, I think there's plenty of guys that would do it.
If it takes $6K to convince the wife to break out the whips for the camera, I think there's plenty of guys that would do it.