I have a camera and I know plenty of other people who has one, so why should I hire you?
Anyone with a camera can take pictures. Some folks might occasionally produce a good picture. Photography is more than just taking pictures. It's an artistic form of communication; a good picture tells a story. To produce consistently great pictures takes skill, knowledge and good equipment. I have invested a great deal to learning photography principles and rules and I have horned my skill so that the photos I produce are exceptional. Hiring me ensures you get the results you desire.
What's your opinion? Do you think anyone can take a great picture? Do you feel professional photographers are worth the expense?