One of the information product I bought on Infopreneur business says:
But one of the big mistakes people make is thinking that whatever they know or whatever they've learned
is actually common knowledge. And because they think it's common knowledge, they don't think it's
worth anything to anybody. It's human nature. Once you know something, or once you've invested the
time to master something, it’s easy to assume that everyone else knows it, too.
If you can add value to the existing books by providing a unique point of view, make it easier to learn and improve on the products currently sold, you can definitely sell your information product.