Ad time tells it all, you aren't bringing in the viewers, you look for advertisers. You stay at the top, they run to you-
Looking at Nielsen’s most current estimates for the Dec. 29, 2014-Dec. 27, 2015 ratings year, Fox News Channel easily led among the cable news networks in the key adults 25-54 demo during primetime. Its average audience of 349,000 viewers in the demo was up 13% vs. 2014, and was followed by CNN with 243,000 (up 30%), MSNBC with 143,000 (down 18%) and HLN with 114,000 (down 3%).
In total viewers for primetime, Fox News Channel (1.829 million, up 3% vs. last year) again outdrew its rivals combined. CNN, which spiked 38% vs. last year, finished second with 730,000 viewers — leapfrogging MSNBC, whose 596,000 viewers was down 1% year over year.