Here's proof that MSNBC chooses to air mostly documentary programming on weekends in lieu of live, staffed news programming, not because they're cheap - but because it works:
On Friday night, the 11 PM "Lock Up" repeat was the most-watched program in the 25-54 demographic, even beating the night's rebroadcast of "The O'Reilly Factor":
http://www.mediaite.com/tv/msnbcs-friday-night-doc-beats-oreilly-repeat-as-top-show-at-11pm/
On Friday night, the 11 PM "Lock Up" repeat was the most-watched program in the 25-54 demographic, even beating the night's rebroadcast of "The O'Reilly Factor":
http://www.mediaite.com/tv/msnbcs-friday-night-doc-beats-oreilly-repeat-as-top-show-at-11pm/