You increase ecommerce sales by showing customers what they need to see in order to feel comfortable to buy your product. The focus should be talking to them about how they want to feel, and doing this live builds trust. People trust live streams because they can see it's not a doctored experience. It makes them think to themselves that they can trust what they see.
What you want is for the customer to imagine using your product while making an emotional connection with them, and removing doubts about your product.
Focus on how your product will make them feel and how it will benefit them. It's like the famous saying "it’s safe to say that nobody wants a quarter-inch drill. They want a quarter-inch hole."
The power of online streaming allows you to talk about what your customer is interested in and show them the product in action. This is why infomercials are so effective, they paint a clear picture in the customer's mind about what they are getting.
A product demo should be persuasive, entertaining, and simple.