I've Noticed Something

There seem to be a race to get advertisers in the comments sections. I guess someone goes through all the blogs, and pick out one to leave their calling card. No comments are left about the subject, just what they're selling. I made the mistake of accepting one of these a while back, and I'll be darned if it wasn't within 2 days, I was getting spam from that very same company. Does this happen to anyone else? I've since learned to reject those types of comments, but I'm wondering, does someone get paid to do that? Maybe a buck a comment? :) Hmmm... not a bad way to annoy people and make money at the same time! :)