Commercial show matches.

If they can hear each other, then yes – use Skype for broadcasting. But if they can't hear each other, I think the idea isn't very good; they'll just be distracting each other.

Of course, they need to be able to hear each other. The question is whether this will distract the player. From experience playing in clubs, I've noticed that some players can play freely and simultaneously discuss what's happening out loud, consult with viewers, while others, on the contrary, become withdrawn and feel uncomfortable even with the viewers' comments, let alone their own speech.