I prefer to write the articles on my own just because of my attitude to my blog. I know that most of the people try to make money out of their blogs, but for me it is more like a therapy of expressing myself, which means that it is all about my thought and feelings at the certain time period. I think that it is ok to delegate writing of the posts to freelancers, but I feel that it is better to use the service of just one author, so that the style of writing will remain the same. It is very important because this whole thing as blogging is based on trusr that the thoughts expressed there are sincere and belong to the author and if you lie to your readers, they wil not forgive you.