When joining a dungeon the Game Arena points don't go down. in other words you are not paying anything to join it.
Second, When inside the dungeon and you have killed the bosses you are not awarded with any valor points.
And last dungeons give epic drops.....
I have seen quit some people getting Shatterd hope and other high uniques with 100 dura.
Edited by Cortiz, 05 July 2014 - 05:54 AM.