When new bloggers get all this spam, they are flattered. They actually think people like their site.
Look at this poor blogger over at the Warrior Forum. He thought all the spam comments on his posts were legitimate as they were telling him how wonderful his site was (its not!) and how they wanted his RSS feed and newsletter. I feel quite sorry for him as he had to be told that all the comments were spam and none of those posting the comments had actually visited his site, let alone read what he had written. It was all done by an automated spam bot.
I feel sorry for these people. Its a steep and harsh learning curve that newbies need to go through when it comes to dealing with blog comment spam.