While I was on JonhChow.com, I saw Mr. Chow's article on copyrights violators (Do People Respect Copyright Anymore?), it appeared to me that many people fear auto blogs (see the other thread) and content thiefs.

The question is, wouldn't it be more profitable for your blog (or website) to adopt copyleft (http://en.wikipedia.org/wiki/Copyleft) policies?
I mean, as long as people input a link to your site as being the original source of the content, in which way is it harmful to let them copy entire articles BESIDES a seo perspective?