For me the difference is a copy of a real painting will never be exactly the same one that was originally painted. It might be so damn close you can't really tell them apart but you'll always know that copy never actually sat in the artists studio while he pored blood, sweat and tears into it. Having that actual object has weight.
A digital file? You can copy it 100% exactly over and over and over again. I would personally wonder if whatever video file the buyer ended up with was actually the prime file that came of the camera in the first place? Maybe, but I don't think you could ever know 100% for sure. How would you tell it apart from a backed up copy? A backed up copy isn't the original and would have as much value as ripping it off youtube if having the original file is your desire.
I can understand the desire to own the original Mona Lisa or even to own a prop that was used in a movie you love, even if there are multiple versions of it. It was still there at the movie and has a real connection to it. It's a thing you can hold in your hand and know no one else has that exact one because it's there in your hand.
A digital file is just not the same.