Here are a few of the reasons listed for not commenting:
- No linear connection between comments and the original post
- Intimidated by the excellent writing style of the blogger
- Takes time to post a coherent comment
- Need to read through other comments to avoid duplication
- Don’t feel you have anything useful to add
- Too many passionate views so no one will listen to your comment
- Blogger is a SME and I couldn’t add anything
- Read blog using a reader rather than going to the actual blog
- Fear ridicule from other bloggers
And the # 1 reason is that many blogs require registration and login, which is time consuming and it requires you to remember your username and password.
Any comments? :-)
BTW, if you haven't read Freakonomics make sure you check it out. Even my wife enjoyed it and she wouldn't claim to know anything about economics.