Every now and then, I do the Nemesis dungeons (still in solo mode) as a DE. In the beginning, it took me 40 minutes to clear a dungeon. After enhancing the defender's gear, this time dropped down to say, 15 minutes. That's still twice the time the ghosting people take to complete these dungeons.
Maybe the Dungeon Damage Indicator (the boring window that can't be closed) could be of some use now, in order to calculate drops and gold!
I mean, the more damage the player/party deals inside the dungeon, the better the odds to get stuff from that place, in a general manner. This would somehow pay for those who crawl longer inside.