Hello Funk,
It’s a pleasure to hear from you.
Well, surely you can use a demo video to describe your product indeed. And needless to say, videos have more engaging power than plain text. But your videos must be high quality and contain relevant content targeting the right customers. On the other hand, a money-back guarantee can bring you more customers by giving them confidence in your products. Most importantly, it provides your customers a sense of safety when purchasing a new product.
Have a great day Funk!