I have friends that went to D3 schools like Wisconsin-River Falls and Wisconsin-La Crosse that are in friggin' fantasy football and basketball leagues with just the WIAC schools. And even though they're only like $15 leagues, they are INTENSE. I'm sure those guys would bet every week on those games if they offered lines.
Spalding- would South Dakota State go with the NDSU and the Sioux to the Big Sky? I spoke at length with the AD of SDSU when their move was being discussed, and I know that the Big Sky had been an option, but the travel was a big issue with schools like NAU and Sac State having to travel to to places like Brookings and Fargo.
I would think a league with the two NoDaks, the two SoDaks, the two Montanas would make a lot of sense, at least geographically. Then throw in some combo of Idaho State, Eastern Washington and Weber State. Hell, Wyoming would actually be a great fit there, but can't see them leaving the WAC for the Big Sky.