This needs to be stopped, and immediately.

[Alphras]

I am a high level player and I have no problem letting anyone watch the cutscene. If I saw someone get kicked because of watching a cutscene, I would leave the group. And since Im a tank, good bye group

Well i have no problem with that too, but many people do. And no, both instances only need one tank (and one healer).

Edit:
And you don't get that these players need to use the random roulette for the bonus. There is no point in doing it via party finder.