if u want a challenge place then go Marlone Clans Hideout (enter via Burning Hill)...
they hit hard and u'll lose stones even faster! But its a challenge indeed...
(The aim there is to get a party to find and kill King Marlone as he potentially can drop awesome weapons)
Abyss is more for massive AOE kills for lotsa exp... but at lvl 2x.. people havent got enough skills to AOE so many that's why its not worth it... at those levels...
(can never please everyone ay? ppl go "OMG why dont we hv a lvl 2x abyss!" then they implement it and we're like "OMG that's not worth it"
)