But when ppl do AK or WP, quite possible every one has ran the dungeon for 50+ times.
Also gear level make a huge difference. In AV your gear possibly sync down to like 55, 6 more than dungeon level. Where in AK many ppl are in Full DL, which is 20 more than dungeon level, not to mention Myth/Coil/+1 gears are 40 levels higher.
When I do AV for the first time, 2 of the party member has ran that for few times so they know it well, we clear the dungeon in 1 try.
When I did AK few days ago, one of the party member only got iLevel 55 weapon, and don't know the fight very well so he has been hit by Deamon Wall's ground spell multiple times, we wiped 2 times.