Live coverage question.

I was watching some GPs and enjoyed the fact that during the race, they show some live go pros (helmet camera) to see the action from another view.

And i was wondering, why dont they do such a thing in the Sx or even during the outdoors ?

As far as i remember i have never seen that in the us. Were they doing that a couple years ago and stopped or just never did ? Also why dont they do it ? I dont think its because of the technology either it doesnt seem like hard to do..

That would be amazing to see some epic battles from live helmet cameras !

Anyone has the answer ?

Thanks