In order to sell more product, deliver more services, and grow your business you need to understand what motivates your customer. When determining the content of your web site you likewise need to understand what information people are looking for.
People's needs, drives, and personalities can be categorized in many ways. Hundreds of books and dozens of consulting firms exist due to this impossible quest to figure people out.
Your product, service, or web site will generate more interest if it addresses some of these basic human wants.
As you can see this list of human wants is not much different than what Maslow proposed years ago. If your message can address some or most of these wants, then you will get more results.