Because Cursed chest only spawns on 2nd floor and mobs spawned from Cursed chests can be champions and T6 champions can be too hard to kill for many people running this profile. That said, for WD/Barb/Crusader is it no doubt better to just run Ghom T6. Getting 1,6b XP/H and 8,5 G/H there myself and it's extremely consistent. For DH/Wiz though this profile is still probably better. Monks... Are hopeless.