Jeremy at WebproNews has an interesting article written after meeting some comment spammers.
‘One of the comment spammers asked me: “You know why we spam blogs, don’t you?” And I knew the answer. They do it because blogs are easy targets and because, just like e-mail spam, it works….
Then a partial solution is fairly clear. I’ve heard and seen others discuss it over the past few months. The search engines needs to be smarter about reading and indexing content.
Read more at Some Comment Spammers Have Blogs Too
About Darren Rowse
My name is Darren Rowse and I’m a full time Blogger making a living from blogs like 
Interesting stuff! I’m just getting started with blogging and trying to gain some insight into writing articles. I like your style!