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With WP and the right plug-ins, spam shouldn't be a problem. In my opinion, if you can get surfers commenting, they would be creating content for you. Pages getting updated by surfers and comments will probably add more keywords or related to the page.
They get a link but WP has had nofollow in comments for some time, so they don't get link trade value. If mostly surfers, they probably won't have a website to submit anyways.
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