What does every blogger want? They want repeat visitors. Every blogger works hard to create content that makes people keep coming back.
What drives me crazy, and is my biggest pet peeve about certain blogs? It is the default settings for subscribing to a blogs comments after commenting. I catch it most of the time, but it drives me away more than it keeps me coming back. It is just pure annoying getting 200 separate emails for every comment someone posts, and going through the whole unsubscribe process to stop the bleeding.
Just do everyone a favor, and make the default so you don't automatically subscribe to the comments.