Side question to the main focus but I'm curious, have you found it to be profitable writing a book? Don't need to go into specific numbers but just roughly. It

Side question to the main focus but I'm curious, have you found it to be profitable writing a book? Don't need to go into specific numbers but just roughly. It seems that for the amount of time it takes to write a book and the profit made it would work out less hourly than doing contract software work and the value in writing a book is more in self growth. I may be completely wrong though so just wondering from your point of view if you would recommend writing a book to someone else? thanks