Because you never know what trivial bit of information may ultimately prove to be vitally important.
Actually, I think this is the point of American Idol and the many imitators. It is refreshing to see people who sound good without all the added sound engineering. DLR would not have made it past the first round on Idol. On the other hand, the rest of Van Halen must have sounded pretty darn good, 'cause that was a great song back in the day.