For me, I am a teacher by nature and love creating products that teach people how to do something. It's a lot of fun and my passion. Creating an info-product allows an outlet for this.
Also, I realize that it can help build confidence in oneself as well. When I first started out, I was insanely scared and did not know if I 'had it.' Now, I can't even believe I used to think like that. Doing something by yourself in an area that you're not familiar in is a great way to foster confidence.