Since everyone has lv15 gear, the event will be a mess, will be almost impossible to kill one another on first floors.
First time they did it was the best one
Dont know how they can adapt it now, since only weapon/uniques will matter
But yeah 1 account per player seems fine,
i dont think they need to restrict more stuff then that,
but if they would i think they need to block Food which make it totally impossible to fight at that floor level