Know Their Exact Intent When They Visit Your Web Page

Why?

To better match what you are “selling” with what they are “buying.”

How?

If they stay on the page for a while (enough to indicate some interest), have a question pop up asking them what their intent is. For instance: “Hi. Let me help you find what you want quickly and easily. Please click on the one most relevant to you: 1. I want to buy this now. 2. I am not planning on buying right now but am looking for more information. 3. Other _________.”
Use the input to tailor your immediate response to fulfill their desire (and yours), and collect all answers for later analysis.