In the United States, the average salary for an illustrator is $49,000 per year. However, freelance illustrators may charge anywhere from $25 to $100 per hour, depending on their experience and the project requirements. For example, a book illustrator may charge $3,000 for the illustrations in a children's book.
There is no one answer to this question as illustrators' rates can vary greatly depending on their experience, style, and the type of project. Generally speaking, however, most illustrators charge by the project or by the hour, with rates ranging from $50-$200/hour. Some may also offer discounts for repeat clients or for larger projects.
In conclusion, illustrators make a lot of money from their services. They are able to make a comfortable living from their work, and their work is in high demand. This means that they can charge a lot for their services, and they can make a good living from their work.