I'm reading a business book right now by a guy from the Economist called The Long Tail. It's kind of complicated, but the guy came across an interesting theory in his research called the "98% Rule". He talked to the folks at internet places like Netflix, Rapsody, iTunes, Amazon, etc. and found that about 98% of their entire inventory is sold at least once a quarter. So even the most obscure niche products are getting sold/downloaded at least 4 times a year.
I think that's kind of NBCSN's approach. While ESPN and FS1 are fighting to the death over NFL, NBA, College Football and College Basketball coverage, NBCSN seems to be focusing on hockey, motorsports and soccer, which are moderately popular sports with dedicated loyal fanbases who are passionate about them. Could be a winning strategy, in my humble opinion. And certainly a lot cheaper than ESPN and FS1 dishing out the megabucks for the super popular sports leagues.