Children’s books is not a bad niche to be in. The books are short and relatively easy to make and the market is large with a substantial demand for quality works.
A good example is the book Goodnight, Little Monster by Bonnie Leick & Helen Ketteman. The book is 34 pages long and has beautiful illustrations and a fun quirky story. According to our best estimate, the book sells about 420 copies each and every day. That is roughly equivalent to $1176 in take-home royalty each day.
Monster profits for a monster book. You can find more books like Goodnight, Little Monster by searching our weekly lists.