Dev Blog: Regarding Weapons that deal a % of an enemy's health

[VROOMIGoRealFast]

So with Mausoleum getting harder as we level past 66 and weapons getting nerfed. Unless theres a better source of income map wise. Why would anyone want to level up and struggle with maus when we can all stay 66 and earn our gold easier?

Oh maybe I worded that poorly.

The difficulty of M6 will remain the same, even though players are leveling up and getting stronger. So it wouldn't be easier for you to stay at 66 and farm it, as the newer gear you'll receive will be stronger.

Example
As an example, if the Dragon Hunter Staff were to be re-released at level 71, the % health damage of the proc would be the same, but the capped damage would be higher, which would result it in being better in the Mausoleum than the current Dragon Hunter Staff.