While I get your point, because of time-zone differences, occasionally people tend to miss the more "productive" hours of a couple- when we're awake and able to watch, they're asleep, or at work, or simply not available to view.
Recordings such as these allow us to return to a time that we would have enjoyed watching but were unable to for one reason or another. Of course, I would prefer viewing it live, but sometimes that's simply not an option; I can't exactly watch them having sex live on streaming video while I'm at work.