DPS guilty of it? Yeah, LOL no. If you're lucky enough to get a queue in under 30 minutes there's no way in hell I'm going to go "Hmm.. TROLOL let me withdraw and wait another 40 minutes". Most of the time in scenarios where DPS are the only ones unchecked is because they've been waiting so long that by the time the queue pops they don't have time to do whatever they signed up for. On the off chance you get lucky and get DF to pop in like 10 minutes its usually an empty instance where everyone rage quit and left. (This of course if you have join in progress checked)