A Key You Can Photograph Is A Key That Can Be Copied

If you take a picture of a car or house key, could you use that picture to get a copy made? Yes--quite trivially, actually. I have a folder on my laptop that is filled with photos people have taken of their keys and put onto the internet. Every few weeks, I take some idle time and associate one of those keys to an address (lot of Googling, mostly) and then I decode the cuts in the key.