i see your point. but, IMO, it'd be money i'm not willing to pay. Pictures could always serve as a way to solve a dispute if your friend decides to make claim to the snake. He certainly won't have pictures of your snake that date months back.
However, in the event that they are stolen and you do not know who took them, if someone runs a scan over them then yes, they could find out who the true owner is. If i was running a milti million dollar snake business, and I am at risk for theft, then maybe i would consider it..but i'm a small timer right now and don't feel it's really necessary.