If you've opened the LFG in MoP Remix, you may notice a lot of posts about «Gate Farm». These farms are exploiting by bypassing the 10 dungeon per hour limit and may have action taken against players who use them.
We highly recommend that you DO NOT do this farm.
In all versions of Retail, instances (dungeons or raids) have a maximum limit of 10 per hour for your entire account. As a very basic example, if you complete your first dungeon at 1:05 PM, and do 9 more dungeons, you will be unable to enter any other dungeons or raids until 2:05 PM.
The «Gate Farm» is knowingly bypassing this instance cap using a clearly unintended method. Because of this, Blizzard may take action against accounts who use this Farm. If you do decide to do the Farm, know that you are willingly and without any doubt bypassing a rule of the game.
Because this is an exploit, we will not be sharing exactly how it works — the important part is that it bypasses the 10 instance per hour limit of Retail WoW.
The non-exploit version of the Gate Farm should be safe to do. Run in, kill all the mobs before the first boss, get amazing loot, then reset. If you're not doing the specific steps to bypass the 10 dungeon limit, and only do 10 dungeons per hour, then you're not exploiting! The actual farm is very efficient, but the reason that it turns into exploit is when you bypass the 10 instance per hour cap.
Why is this different than other farms like the Frog Farm or the Goat Farm? There's a level of plausible deniability. Frogs dropped and were used to farm Lesser Charm of Good Fortune back in Mists of Pandaria, and also were still on live servers for those who want Bonus Rolls for old raids. There was no way for players to know that the current dropping of Lesser Charms were supposed to be unintended in MoP Remix. For all players knew, it was a great homage to the Great Frog-culling of 2014.
Gate Farm is clear as