Nine Inch Nails does a better job than most bands at marketing. What's their best marketing scheme? Give stuff away for free.
From their most recent blog/ forum post,
The internet is full of surprises these days.
I was contacted by a mysterious, shadowy group of subversives who SOMEHOW managed to film a substantial amount (over 400 GB!) of raw, unedited HD footage from three separate complete shows of our Lights in the Sky tour. Security must have been lacking at these shows because the quality of the footage is excellent.
If any of you could find a LINK to that footage I'll bet some enterprising fans could assemble something pretty cool.
Oh yeah, you didn't hear this from me.