Please read this great article from Ten Tiny Toes Photography. It helps explain alot about the costs of photography. In a nutshell, I love photography and taking photos. Mostly, I like producing the end result and seeing the smile on people's faces. At this stage of my photographic career, I consider it a hobby. Every good hobby costs money and mine is no different. When you read the below article, it might help you understand.
http://blog.tentinytoesphoto.com/why-does-custom-photography-cost-more/