How does that make them money? Or is this an "actual conspiracy" take on the situation?
I think it's just irrational adherence to tradition, like umpires in baseball. I suppose there's some drama inherent in the whole chain gang routine when it's used but I think people being upset is not beneficial.
I was also reading somewhere that the tracker inside the football (yes, there is one already) isn't yet accurate enough to be down to the inch and do so in a timely manner. It's a more complicated issue than boundary marking, apparently, though one wonders if they're actually putting much resources into solving the technical hurdles.