There is a significant difference between a finished professional photograph and an amateur with an iPhone. It takes a knowledgeable eye to pick out a good shot that looks nice, and even then, your photographer will typically take multiple pictures to ensure the lighting is correct, there's no blurred motion, and so on. No matter how many pictures you take as a photographer, the client shouldn't be privy to all of them. After developing the photos, photographers dispose of any that don't look good. Clients see an edited version of the pictures with no stereotypical problems like bad angles, closed eyes, etc. Ultimately the photographer only edits and delivers around 10-30 pictures per hour because those are the most precise, attractive, and visually stunning images that have been worked with to give the best possible clarity and other features.