I jungled a few times in PBE, and found no reason to stay and farm, and found It actually harder not to in some cases. Any champ who has a weak clear is basically ****ed if they have to farm, and cause the jungle hurts more, they cant gank as well...The only reasons iv seen that junglers will gank less is when they are forced by low health to stay in the jungle. Doesnt seem like the best system. I would rather a system that rewards for jungle farm instead of punishing for ganking.
because of the ridicilous scaling and the gold sink of jungle creeps it actually isnt viable to gank early at all
you just cant, you will have no team presence