IU Hawks fan
They call me IU
Every Big Ten team makes more money off the Big Ten Network than Notre Dame makes off their national deal with NBC, or at least that was the case as of a few years ago. The huge amount of money that schools get with that contract is essentially the sole reason why Maryland decided to join over fan opposition.
But that's just their football deal, you're not accounting for what they're getting from the ACC at all here.
TV wise, ND adds nothing to BTN because they're not adding any new markets if they come in. Maryland and Rutgers are being added so BTN can penetrate in New York, DC, and Baltimore. That's the only reason they picked those 2 schools.