“Why should I buy prints from you, and not just get them printed myself?”
A completely valid question. Everyone owns a digital camera these days, and as a result, print labs are everywhere. They all use similar printers, and many of the home printers are more than capable of printing photos for you to use. So it begs the valid question, why not get photos printed yourself?
The biggest reason to have a photographer print your photos for you is quality control. I, and most other professional photographers make sure all the colors on our monitor(s) are exact and accurate with printer colors. So this means, that a photo, should look exactly like it does, on the photographers monitor. This means, no surprise color shifts, and everything looks exactly as it should.
Another reason is color profiles. Do you know the difference between AdobeRGB and sRGB? Well, one is for printing, and one is for web. Often, photos are converted to sRGB so that the color is accurate when being viewed online. But, AdobeRGB has about 1/5th more colors available than sRGB, colors that many computer monitors cannot even display. This conversion process is a confusing one, and when done incorrectly, your photos can end up looking dull in color.
One of the most important reasons to have the photographer print the photos is satisfaction. Photographers can't control how prints look with other printers and know that our client is going to be 100% happy with the photos we present them with from our own printers. You've already invested your time and money into the process of documenting, don't feel tempted to save a buck and get a bad print.
The print chart below is great example of what happens when you use different printers.