Check the math again, with 0% crit dmg bonus the formula gets you non_crit_dmg * (1+0) = non_crit_dmg
Just tested this with Bloodbath, and yes, there seems to be an inherent +50% bonus.Really simple example straight from a parse on a strawman. I'm using GODS procs because they do not vary except for buffs/debuffs on yourself or the enemy. Non crit for GODS proc: 141. Crit for GODS proc: 252.
Yet, if you attack a strawman unarmed (so that your hits do constant damage), your crit damage will behave according to the formula I posted before. Weird - gonna do some more testing on this.