Interesting -- so are you ruling out the possibility of storing the data in the future for features like periodically checking for updates in my rate? That sounds like a killer feature (that I would even be willing to pay a subscription for), but then I'd also want to be damn sure that you're storing that data well.

EDIT: in fact, for a subscription based service, you could figure out the optimal pricing quite easily. If the annual price of your subscription were less than the typical insurance savings by having it monitored, you'd have a hell of a business model.

That implies you're keeping such information with my session (across requests). Is that the case? I may just be misunderstanding.

If so, you need to encrypt it first. Storing sensitive data in the user's session is akin to writing it to disk in plaintext.