For the first couple of years, the BTN would add a few (like 10) new games a year to the library, with a press release and everything. I haven't really heard anything about it in the last 2 years as it almost seems like the new games that get added are just the best from the previous season, because it's so easy. Thank God Purdue upset OSU in 2009 in a game that's actually pretty unwatchable (sloppy on both sides, not even really that close) - we wouldn't want the BTN to have to splurge on the scintillating 1999 OSU-Purdue game that was won on a blocked FG in the rain.
Also, are they averse to conference losses? Sure, UM losing to App State was a blackeye for the conference, but it was a damn great game and would produce great schadenfreude-based programming for fans of the conference's 11 other teams. You don't think non-OSU fans would enjoy watching Vince Young kick us in the balls again?
On the BTN site, under Grestest Games programming, they list the next 10 broadcasts upcoming: 8 are from 2007-2012, one is from 2000, one is from 1984 (and it's PSU, pre-B10).