Let me show a simpler example.
Let's start out with a group that does 100 DPS.
When fighting a mob with 25000 HP, your group will kill the mob in 250 seconds.
If you doubled your DPS to 200, which isn't difficult, you will reduce the kill time to 125 seconds.
Doubling your DPS again to 400 would be much harder, and would reduce the kill time to 62.5 seconds.
As you can see, you get diminishing returns on time saved when it comes to adding DPS to your group. Getting to 200 DPS in a four man group is easy. 2x Enchanters with charmed pets is already around 170 DPS with hasted level 47 mobs. The other two members will easily get your group to the 200 DPS mark.
The only way to increase your DPS to 400 would be to bring 4x Enchanters, which most people agree is too risky. The additional 2 Enchanters are only saving half the time of the first 2 Enchanters (62 seconds vs. 125 seconds), while significantly increasing the risk of your group dying.
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