I'm going to disagree here. Jarrod, a designer, wanted to create a book that would be beneficial to you (presumably, a developer). He had a skill you wanted to

I'm going to disagree here. Jarrod, a designer, wanted to create a book that would be beneficial to you (presumably, a developer). He had a skill you wanted to know more about to use to your benefit, which is probably why you signed up for his list. By getting potential customers early own, not only is he more motivated to get the book out the door, but he can also talk to his first customers to see exactly what they want to learn that he can teach. Great work, Jarrod!