I know this post is a bit late... but...
Potency of the venom really doesnt have much to do with how dangerous they are, in this case. Their venom delivery system is very poor, and they only delivers minute quantities of venom (thats if it even chooses too).
You will find that pretty much all of the recent research done on small elapids state that their venom is very potent. However, their yeild is so small that it has little or no effect on most people.