Every 8/8 T2 Hunter, on average, attributes about 9dps to the bottom line to every other hunter in the raid. And yes. It stacks.
If you had a raid with two hunters, one with and one without, the set bonus would attribute about 18dps. But, if you have two hunters with the set bonus, it becomes 36dps.
If you have ten hunters, the math looks like this. (10^2)9=900dps.
If you have twenty hunters: (20^2)9=3200dps.
Thirty hunters: (30^2)9=8100dps. Adding 270 dps to the bottom line of every single hunter in the raid.
As you can see, every hunter added exponentially increases the output of the set bonus. The game plan is to stack raids with 26-32 full T2 hunters and see how far we can push this absurdity.
Can we break a few records abusing this mechanic? Let's find out.
Edit: We found out.
-Gunzbngbng, Herod Horde