As I mentioned in another thread, the whole idea is about "branding" your news. Why waste hours, despite low ratings, when you can plaster your talent and news logo all over the screen, despite the early hour? And it is so easy to recycle reports from your previous nights newscasts, (especially the sports report). And finally, if you can get viewers to trust you for news/traffic/weather at that early hour, then you pretty much have them the rest of the day. It isn't too much different from a good radio morning show. Hook 'em early, and you have them all day. TV has learned from radio in this laboratory. More power to them.