Yes, being a dick spammer works, for a given definition of "works". I unfollowed Guy Kawasaki a very long time ago, and I'm pretty sure most people who care about their keeping their tweet-stream interesting have, too.
A lot of people don't use Twitter the way you do. If you follow two thousand people including Guy you might never notice that he is repeating tweets. What's wrong with optimizing for those people? You are free to not follow.
I follow 600 people, but I still notice spammy people. I followed Guy Kawasaki for a short while, but soon decided that he wasn't worth following.
What's a "dick spammer"? A spammer solely dedicated to p3ni1s enlargement?