Originally Posted by
transparent
Four raiding levels, LFR, NM, HC and Mythic, plus you have WF/TF possible on every item being dropped. They need to have a power difference between the difficulties be worth it for the harder content. If LFR dropped 885, NM 890, HC 895 and Mythic 900, it just wouldn't be worth the extra effort that you need to put in to the harder content with such a small power increase, especially when you have WF/TF.
In the same vein, you can't have LFR drop 860, while NM jumps to 900, HC 920 and Mythic 940, the forums will explode screaming unfairness.