See here in lies the problem. The No Deaths was implemented as a Bonus, but treated by a large part of the DDO population as a Penalty. It was ours to earn which should have generated teamwork, but out of this came a population of "I don't want someone else losing my XP". I think part of the problem is that it is listed on the XP report from the start and disappears once someone die.
I've spent many a time consoling someone that was have a hard time because they had experienced someone that was mad at them because they died.
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Now on another note and I'm not sure how this can be handled, but what about situations in quests where a player can kill other players. Quests like Undermine and Blown to Bits come to mind. as well as The Shipwrecked Spy. These quests have a mechanic which can be and has been abused. I imagine if these quests were around when a player lost XP the griefing that could have been done...
But I can also see people bringing others along to "take one for the team" to handle situations where dying is a possibility. Such as pulling a trapped lever when no one to disable (Wiz King has a few of these)
Personally I would have preferred to see this bonus go away all together and replaced with "Everyone Alive and at the 'End' of the Quest" on completion bonus. It would make it so that it is better if you make sure everyone can make it to the end instead of leaving people behind.