Smart players wouldn't AoE and would be more careful of what mobs they aggro. Just because you can kill a number of mobs with AoE attacks does it mean you should get more SP than someone else who has no AoE attacks? They way it is at the moment is fair for all classes to level up at a reasonable speed. Doing it any other way would give AoE heavy classes a huge boost in SP gain while giving anyone without AoE skills a disadvantage when it comes to grinding.

There really needs to be more incentive in this game for people to use single target skills instead of constant AoE's, like reduced damage/healing and increased MP costs.

Upon further consideration, this might work if damage from AoE attacks is dispersed in the same manner damage from 1000 needles is dispersed.