For IB, it is worth the cost.
Of course, people have IB careers from IU Kelley. Of course, not everyone who attends ND can have a career in IB. People bring things like this up as if it is a surprise to you, which it likely isn’t.
Your child has one life. One shot at all of this. If you have the means to pay for it without taking on debt, send them to ND.