Ignore lists are a personal thing. For example, I put people on ignore for excessive formatting in their posts, and for the inclusion of images that I consider to be useless and thread clogging. Other members think that these things are beneficial to the forum. I wouldn't suggest that there should be any punishment for being on my ignore list, other than the fact that the member won't reeceive any merit from me of course.
Of course I believe that members making very low quality posts shouldn't be encouraged or rewarded for their posting. Pleas note that I didn't refer to "people with low quality", we try not to discriminate against people on the grounds of race or social class here.