Jungle experience nerfs encourage ganking more than farming.
I have seen multiple games where one jg is up in cs but one to two levels behind the other jg.
This is do to the fact the other jg has successfully ganked a lane and gotten a kill or assited in one gaining more experience.
I thought the idea of a the jg exp nerf was to make sure junglers had to cs more (meaning that they wouldn't be constantly ganking) to stay relevant but instead it seems like they are snowballing ahead of the other jungler by just ganking.