I'm sure this has been covered (probably ad nauseum) in the past, but searching both the forums and Google didn't turn up a satisfactory answer. What is the relative impact of a non-color-breaking bend vs. a crease of the same length? I see references in the Overstreet Guide (which as many have discussed is inconsistent and unclear at best), but also know that CGC doesn't adhere to the same guidelines. Useful tools like the "Ultimate Comic Book Grading Cheat Sheet" that has circulated online is also helpful, but references creases rather than bends.
Any rules of thumb? Obviously, a 1" crease with color break would knock a book down much more than a 1" slight bend with no break, but how much less? For example, if a 1" crease with color break on an otherwise perfect book knocks it down to an 8.0, what's the impact of a light 1" bend with no break?