I do wonder if this game is playing for a consolation CBI like tourney invite, the winner getting an invite and the loser's season being over. Although Ball St has already hit 20 wins, maybe they get one regardless.
I think that Ball State will get an invite even if they lose. What these tournaments do is unpredictable though. The NIT didn't claim to be based only on merit until 10 or 15 years ago. They lesser tournaments, as far as I know, still don't. But bids are also turned down fairly often. Sometimes they have to dip pretty far down the would be order.
FWIW, we are a 1 point favorite again. Vegas is confident that the line should be almost exactly zero but not a all confident who, if anyone, should be the tiny favorite.