If you dc, you get the 30 minute lockout too. I know this because I DC'd in the wolves den and couldn't log back in in time and suffered a 30 minute DF cue penality.

And tanks and healers already DC/abandon at the very beginning of runs...so your point?

I cue almost everyday as a healer/tank 'join party in progress' and get 0/4 as my party and end up at the very beginning of the duty...not a single mob pulled. So your point? People already do this when they use Dungeon Roulette...but at least they are penalized for their behavior.