While I do get your point and all, I don't really think this change would matter all that much compared to any amount of time they'd have to put into it. Human error can happen with the dark matter and all too.

I would think a better solution would to have an NPC at the beginning of each dungeon that could repair equipment and that's it. No selling to him, no items for sale, just a repair guy for those times people derp. I would suggest adding the option to leave a dungeon and come back to it without dropping group and all, but I could see that causing a few headaches without a kick feature and people just generally being jerks sometimes.