Include Q&A sessions and other discussions as a perk for your membership sites. You can also organize paid Q&A sessions for your audiences with you or other experts associated with you.
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To gain the trust of an audience, you can conduct polls, measure the market and make adjustments according to demand. These polls will help gain feedback from your registrants about your products and services, and get important information to make decisions.
You can involve sponsors in your webinars to make money from sponsored ads and announcements which run in between of your webinars. It can be very beneficial when you are attracting larger audiences through your webinars.