The only reason this would exist is for glamour, as you'd easily outlevel any piece of gear in a levelling dungeon after only a few tries.
Sure it's nice that you can get your glamour piece after 10 or so runs instead of 20+, but those 20+ attempts end up helping Greenleaf Newplayer with his first time in, keeping the queues healthy and filled.

You gotta think of the bigger picture as to why you're going back into that dungeon. It's not for that piece of gear, it's because SE wants you in to help new players with maybe a cool piece of gear as your reward for doing so.