The easier tool to sell is the easier to use
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A web site or application provides a user two things: the product or service you want to sell or promote and the way to do that.

The first part of the sale is a nice and easy to use interface. If the media does not facilitate the access to the product, this one may not even show its attributes.

Usability is the ease of use for the achievement of specific goals. It involves to understand and relate business goals, and the mental model of the user/client, its level of competence and its cultural environment.

The AI (Information Architecture) is the "back end" of usability. It includes all processes, methodology and necessary documentation to ensure a successful user experience-oriented to the business goals.