The significance of regurgitation isn't necessarily in the numbers, but the ratio of enmity:damage. It's assumed that since you take so little hate, you can do more damage than other BLUs through multiple casts. The only issue I see is that MP might provide a means through which this is limited (i.e. will you run out of MP before enmity becomes an issue? will you kill the mob before enmity becomes an issue?).
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