Jungler's guide on when to Power Farm and when not to Power Farm.
I'v started to see this a lot and 5 months ago it's the reason i went from Mid to Jungle.
Jungler's that SHOULD NOT be power farming, say Elise, Lee Sin, Olaf ect end up power farming while every lane is being pushed in, camped or beaten to death by either their own laner, enemy laner's or the enemy jungler.
Here's the thing, CERTAIN JUNGLER"S power farm, not all of them.
Power Farming Jungler's(2 Types):

In Master Yi's case he enjoys having large amounts of gold because he needs it, he's a hyper carry jungler. Hyper Carry jungler's like Master Yi will power farm for most of the game, only gank when they need to or see a good opportunity.
Other power farm jungler's like Evelynn(my main) farm heavily until 6 and then proceed to be a mid game powerhouse, dominating games and running them out of control with extreme kill pressure all over the map, the same can be said for Nocturn.
Non-Power Farm Jungler's:

These champion, and most jungler's nowaday's actually, do not like to power farm. They have a huge power spike at level's 2 or 3 and often gank from then onward, taking camps when they don't have anything else do to.
But wait! Here's the problem, a lot of jungler's i'v seen don't know when they have something to do and when they don't. If you have nothing to do, yes power farm, but when all 3 of your lanes are being pressured DO SOMETHING! Place ward's, look for counter ganks, keep track of sums, flank, catch people out, DO SOMETHING other than letting your lanes lose to the enemy jungler. If you do nothing because your a "Farm Jungler" (a common term used by jungler that are new to jungling.) your only telling the enemy jungler "Hey, i'm not helping my team so go ahead and destroy them."
TLDR: I'm a jungler myself now, so i understand that sometimes you can't do much, sometimes lanes aren't gankable and sometimes your team just feeds(it happens, i do it too.). But, as a jungler it's your job to apply pressure or relieve it in whatever way you can, and if your playing a jungler with a powerful Level 6, but not using it, your wasting your potential as a jungler and making your team suffer for it, this also applies to champions that have strong level 3's, if your not doing anything but farming and your team is constantly getting ganked, do something about it.
and
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,
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, grab my
, then get
and
. Works rather well.
(got an early kill maybe?)
+
(magic pen is OP right now)
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lately and Im pretty sure she's a power farming jungler. I feel helpless pre 6 because her ganks suck without her ult. When is it worth ganking pre 6?