The profitability of writing a book can vary greatly depending on several factors such as the genre, target audience, marketing efforts and the way the book is published.

Traditionally published authors may earn royalties from book sales, which can range from a few cents to a few dollars per book sold, but it also depend on the publisher’s royalty rate. However, many traditionally published authors still have a day job.

Self-published authors have more control over their earning potential, as they can set their own prices, retain full rights to their work, and have the ability to sell their books directly to readers. However, self-publishing can be more costly, as the author is responsible for editing, cover design, and marketing expenses.

Additionally, writing a book can open up other opportunities such as speaking engagements, consulting, and merchandise sales. It can also boost an author’s credibility and open up opportunities for other writing projects, such as screenplays, articles, or speeches.

In short, the profitability of writing a book can vary greatly, but it can be a profitable venture for those who are able to reach a large audience and are willing to put in the effort to market and promote their book.