But Notre Dame gets BCS money all to itself every single year. It's portion is higher than any team in any conference that gets 2 teams in.
Notre Dame gets $6 million/yr (no matter if it gets into a BCS game or not)
BCS conferences get $17 million for 1 team, and $6 million for a 2nd.
Big Ten basically gets $23 million, split 12 ways that is just under $2 million. Under a 3rd of what Notre Dame gets.
Not to mention, Notre Dame is part of the non-BCS Big East Bowl System, so gets a portion of that as well (and being split 9 ways, soon to be 10, is more than the non-BCS Big Ten which is now split 12 ways). As well as a portion of the Big East basketball monies.
So why would Notre Dame want to join the Big Ten again? Definately not for money.
That is my understanding for why they haven't joined as well. Like I said before I would like them to join anyways. With these leagues getting bigger and moving towards more conference games like the Big Ten did this year I think it will get harder for them to get a good schedule every year.
I wish they would just join and have a guaranteed conference schedule. They could still keep their rivalries with USC and Navy if they want. Many ND fans don't want this because they think they would have to give up rivalries or make their schedule to hard to keep them in.