Editing a hub could increase your views in several ways. When you edit a hub, you may add some important keywords in the title, summary or in the body, which could rank it higher in search engines. You can also add photos, especially the one that appears at the top, which could be attractive to your readers than the one in the previous version. This may attract more views by readers who go through your profile or through the featured hubs in various topics. After such readers leave comments, the readers following the hub will get notified and will follow the link to check the new comment. Depending on how much you have edited the hub, readers who had already commented may find it useful to leave a comment, rate it again and even share or link it to hubs with similar or related content. That would also increase your views.