This is measured by comparing the viewership of the previous debates to the viewership of this one. There will be a serious hit in viewership. Viewership = Money. More Viewers = More Money.
I'm not so sure about that, some people might like to see a tag team pounding of Trump and the litany of very dumb things he's said and done. I might be one of them, uninterrupted by personal counterattacks and nonsequiters. I'm getting extra popcorn.