From Craigslist: You can be a comment spammer for $8 an hour! Professional Blogger Needed. Do you Blog?

Your main job functions will be to post blog comments with links to our sites and to exchange links with other sites. Knowledge of html or web design is not necessary, but complete comfort with using search engines, and email is. Your interview will basically consist of us explaining the purpose of this if you are not aware already and asking you to demonstrate how you’d get started. That’s really about it!

When I upgraded SDB to wordpress recently I deleted hundreds of comment spams. Do these people realize how counterproductive their task is? I mean, I suppose there’s a legit PR purpose to some comment posting, but is this not equivalent to hiring a spammer? If not, why not?