As an addition to my previous post, let's take the 5 necros in that group and combine their casts, then get a rough estimate of how much healing they do. This isn't even counting the bard in the group, which can also proc this effect off of all of his abilities.
5 Necromancers:
#1 - 188 casts
#2 - 228 casts
#3 - 281 casts
#4 - 176 casts
#5 - 245 casts
Let's subtract about 10 (which is being over-zealous) from each of those figures to count for things like spires, breastplate effects, glyphs, etc.
178+218+271+156+235 = 1058
Now add in the 1-in-4 procrate for Reluctant Benevolence:
1058/4 = 264.5 casts of RB healing
Let's multiply by that by 4k base, assuming zero critical heals:
264.5 x 4000 = 1058000
That's 1058000 points of health PER GROUP MEMBER for the duration of that fight. AT MINIMUM. This isn't counting crits, or extra procs that go above the RNG's 1-in-4, or the bard in the group.
Please, tell me how this is balanced.
Edit:
Let's look at frequency as well!
264.5 casts over 12 minutes:
264.5/12 = 22
22 casts of this effect, per minute.
Clerics don't even heal that quickly, or efficiently lol