You may not realize it, but there are a million books published each year. It is probably harder to write a widely-read book than to gain a following for a product because of the supply and demand dynamics

The median book sells less than a thousand copies, and many sell less than a hundred copies. I’m reading one right now (razor strike, a cyberpunk story) that is excellent, but I think the author suggested online once they only made a couple hundred dollars off it. Highly recommended btw