Use Free article on your blog is good or not?

If you see some blogs, you will notice that the blog owner don`t write the content (article) by themselves but they use free articles on their blog. And now let me talk some of the pros and cons about republish free articles to your site.  

Free article are the article that are publish by the writer to the article site that allow every one to use their article on every website or blog without problem. But how the authors of those free articles get benefit from them? Yes exactly they are not really generous as you may think. Each free article are include the author`s information at the bottom or the article that describe about the name and short info with also put their website/blog url also. Then when you use their article on your blog/website you must also include the author`s information at the bottom or the article also with it can benefit the author with back link. And the authors of those free articles and get a lot of backlinks due to how many times their article are republished on anywhere else.  

There are many reasons that I think using free articles on our blog/websites is not good. Why? Using free articles really can harm your SEO ranking and page rank also. Google and other major search engines don`t give value to your blog. Because those search engines see your blog has just the same article like other website on the net. One more reason is that if you build the blog/website for profit and using free articles you just found your blog like a junk blog, You just publish the article that link to other people`s website and your reader also can see your blog is not helpful and all in all you can not make money/profit form it.