You're probably right. But I don't have the numbers in front of me. The people who make the decisions only look at the money.
Notre Dame's current TV contract is $X per year.
Notre Dame could expect to get $X + $Y per year in a conference. Let's say Big Ten for geographical reasons. Plus, I think the $Y is the largest if they join the Big Ten, compared to the ACC or anyone else.
What do they make if they make the playoffs? Is it $Y or greater?
If it's greater than $Y, they're gambling that they make the playoffs every year.
If it's less than $Y, they shouldn't care about the playoffs.