I am not terribly worried about identification, I can take a picture, since patterns vary so much in a lot of snakes, I have considered it more for the theft issue.
I have my dogs chipped for that reason also, My sheltie will run up to anybody and given her unusual color she could be an easy target. Her father was stolen once and given how far away he was found, he couldn't have ran away, we believe the thieves dumped him when they found the tattoo he had. So if people know your snakes are chipped they will be less tempted to steal them.