[Captain.Remy]

It still is popular because it fits well to the competitive type of shows American channels broadcast and what American people like to watch. I don't think they could handle daily shows like they used to in BB1.
We can also compare this to Survivor which is more strategy focussed than real surviving in the middle of nowhere.

I see what you're saying, we never know what events happened at what time. I wish they could show the scenes in a chronological order and not on their will which is frustrating. I also wish they'd put the day and the time so we wouldn't get lost. And please get rid of this cheesy songs !