Do you think tags are important? Is there a correlation between large numbers of tags and high traffic or do you think it is quality of keyword tags that matters? How many tags do your high traffic hubs have?
They make a difference to me. I see the results when I modify my tags in existing hubs. After a month or so from first publication, I check to see what keywords people have been using in search engines to find my hub. Then I take the most meaningful and closely related keywords and put them in my tags.
You can find the keywords under the "stats" tab.
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Tags are important because they are one thing that tell the search engines what your page is about. You need to choose tags carefully. I add as many relevant tags that I can think of within the number allowed - some broad and some long tail.