Hehehe, I think you're misunderstanding me (or I'm not being clear).
If the weapon damage is 1d6 + 4, that's a damage variation of 1-6, or 7*(1-6) with backstab. i.e. 7-30.
Though I will agree that it's probably not much by the time you're dealing with 7 times backstab. But it makes a big difference in chapter 2.
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