How many viewers do they have to lose before they start catching on?
Rush had an interesting take on your point yesterday.
He said since the advertisers buy blocks on all 3 of the MSM news shows to ensure they reach all viewers watching any of them, CBS has not seen any decline in REVENUE as the RATINGS of their news show decline.
If true, revenue trumps ratings.
They keep repeating their mistakes because they think the way to get their viewers back is by repeatedly telling them, "you people are stupid!!! Listen to us you bunch of idiots!!!"
Their advertising cost during news is now 1/10th of a successful prime time show. I believe it is $50,000. I posted it somewhere here a few days ago.