What happened with Urbana/NDC?

[purduefan11]

I was looking over some stuff and I noticed that Urbana had been a charter member of the conference, but left early. Geographically they still make sense, but the only explanation I had heard of before was some competition issues. Does anyone know the bad blood that made Urbana leave? As I understand it, Notre Dame College was an early participant as well, but did not make it to the final charter members. Anyone know that story too?

I know the story about Central State, but what about NDC and Urbana? I think they would be the first two targets when it comes to expansion.