"data/traffic to the game"
are you serious?
Voice chat is not a bad idea, go ahead and join any TF2 server or any CoD server, you won't experience lag, or horrible people (Although, if your ping is high, you will experience lag)
Also, voice chat rage is better than text rage because it actually shows who you are, so people wont take as much offence as text based rage, and also, people can't put on music, the only reason you think of that is because you have experienced it in a different game