I would like something like this as well, and I'm saying this as a player without a hardcore group. It makes it feel as though you have something to strive for especially if there are different tiers of loot depending on how well you perform.

It's a very simple example, but the first time my static ran Qarn we really struggled to kill the face which runs away (please don't laugh) and it felt exciting wondering what extra reward there would be if we managed to chase it down. A chance of 'failure' even if you otherwise clear the dungeon makes things feel more involving.