what will happpen if SE removed the 15 limit? Let's see.....

Enter the jerk tank with instant queue. He enters DF - instance pops. He then skips the intro and leaves immediately. The other players won't even see his name, since he is gone before they load up wasting the long waiting time for the dps especially. And he can do it again and agian and again.

And that has already happened to me - even with the 15 penalty.