Then you ask them follow up questions to make sure they understood your presentation, what they do not understand, what objections they may have, etc. etc. You will close more sales if you are able to get feedback from clients, and Webinars allow you to see their face, to hear their voice to know how they are feeling about you, your presentation, your company and your products and services.
You’re already a big winner when you’re in front of your webinar audience. Participants were interested enough in your content to register, hold space on their calendar, then show up attentively to your webinar. They have self-qualified themselves as being in the market for the type of product or service you offer, and think you’re the God of SEO (or whatever your schpeel is on).