What are the benefits of registering, I can't help but hear you bellow?
MESSAGING
Amazingly, I've actually bothered to put in private messaging, where you'll be able to send messages to the people whose stories you love. Or hate, knowing you.
PRIORITY
Anonymous stories start off red. This means they'll only appear in the random menu, and can't be permalinked. Admins can lift them out of that, but do you really want to be at the mercy of invisible admins, who probably don't even look at their shitty red piles?