Can CGC grading reduce a comics value?

I'm a big fan of ComicsPriceGuide.com as a pretty good guide for comics prices. It's not perfect but it is a big help. I've noticed in the past that lower grade comics have no effect on a comics value but I noticed something today I've never seen before. For issues graded 8.5 and lower of the 1968 The Hawk and the Dove CGC grading actually LOWERS the price. That's actually makes some sense to me and I'd like to see this more often (sorry CGC).

It's actually not a heavily graded series but for me I was interested in buying a reader copy. If I wanted an investment copy I would have gotten a high grade CGC version so I specifically wanted to avoid CGC slabbed comics. Has anyone else seen CGC grading REDUCE the value of a comic?

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