Most of the well known bloggers have accepted the importance it generate. I have also started to publish my guest post in well known blog in make money online niche.
>> Importance of guest post publishing
In my opinion there are three main factors for which you should take it into consideration.
i) Improve page rank (PR) : It is one of the best way to achieve high quality one way back link which is must required to improve your page rank (PR).
Remember: Back links from blog which falls in the same niche as yours will be more beneficial than from other niche blog.
ii) Targeted Direct Traffic: If your post published in high quality blog which get huge traffic then there is a chance that some of the reader become interested to know more about the writer (and blog) of guest post they are going through. Means, targeted traffic to your blog.
iii) Online Recognition : Your guest post is going to publish in reputed blog in your niche. Isn't it enough to improve your reputation online which is required to get more exposure on blogosphere.
while publishing guest post one thing you should keep in mind - Always try to publish your guest post in high quality blog having good page rank (PR) which falls in the same niche as yours.