But, if you are one of those who credulously believe that accepting guest posts is all about those advantages, then you should take a look at the flip side too. Here, I am not trying to disparage you from accepting guest articles on your blog, rather I am trying to reveal the possibly negative side of accepting guest posts too often (all from my own personal experiences...)
No doubt, guest posts are great for helping you to keep your blog updated with fresh content, but guest blogging should definitely not hinder your ability to write for your own blog. Remember, it's YOUR blog and it was your own writing pitch only that initially attracted those worldwide visitors to your blog. Remember Darren Rowse at problogger.net ? Nearly 10 high quality guest posts are published at problogger.net every single week. In spite of this huge incoming flux of guest posts, Mr. ProBlogger still continues to publish his own content there. Why? Because he knows that it is his unique writing and voice only that drives millions of worldwide visitors to problogger every single month! Occasionally accepting guest articles is perfectly fine, but totally depending on them and not adding any voice of your own might leave your blog in the dark.
You receive a grand guest submission and you immediately decide to publish it on your blog (obviously after checking for uniqueness and any possible plagiarism). But your job definitely does not end there. By publishing every single guest post on your blog, you are adding an extra workload for yourself. And that workload is to regularly check that the published guest articles are not republished anywhere on the web by your dear guest bloggers.
This happened with me a while back when a guest blogger after getting his article published on my blog, reproduced the whole content on several other websites without even bothering to notify me. I immediately took his article off my website and when I dropped him an email about the same, he simply replied: "actually I do not care."