[Albright]

There can certainly be value if you think that teaching others what you know is more valuable to you than making a (larger) profit. Altruism is a thing.

Another way to give it away would be to play a long game of sorts by requiring people to sign up to the mailing list to get the free book. That way, you're still building up a list of interested people to spa--… market to when you write your follow-up books (and sell those for a profit).