Many knol authors are not doing promotion at all. They are simply posting a article for forgetting about it.
They need to notice that Knol indicates them to do some promotion immediately after a posting. Send an email to your friends, send a Twitter message. Make a blog post. You can increase page views to your knol through online promotion efforts. Do it and increase page views.
Are Page Views Low to Your Knols? Some TIPS to Increase Page Views