In order to answer that question, you'll need to figure out what people hope to accomplish on your site and whether or not that is actually happening. Have you

In order to answer that question, you'll need to figure out what people hope to accomplish on your site and whether or not that is actually happening. Have you tried collecting any qualitative information about this? E.g. ask your users questions via KISSInsights, interviewing a couple of users, running Userfly or ClickTale? etc. (This post describes all of this in more detail: http://blog.launchbit.com/6-tools-to-learn-about-your-customers http://blog.launchbit.com/6-tools-to-learn-about-your-custom...) Without knowing more of this information, it's going to be impossible to diagnose what would compel people to come back.