What is a major benefit of smart content in HubSpot?

Smart content in HubSpot offers the significant advantage of adapting and changing based on user behavior. This functionality allows marketers to deliver personalized experiences to their website visitors. By utilizing data such as a visitor's location, device, past interactions, or lifecycle stage, smart content can dynamically alter the visuals, messaging, or offers presented to the user. This personalized approach not only improves user engagement but also helps in converting leads into customers by providing them with content that is more relevant to their individual needs and interests.

The other options do not reflect the essence of smart content. For instance, increasing advertising costs contradicts the goal of improving ROI through enhanced user experiences. Similarly, reducing website traffic is undesirable for any marketing strategy, and creating static content does not align with the principle of smart content, which is predicated on customization and dynamism based on user interaction.