Newsletter management via vBulletin

[SystemLogic]

I had a good idea for a hack. I don't think it has been done before, but if it has, please let me know where I can find it.

Basically it's a newsletter management system.

How it works is this:

When you register for a forum there is an option with a check box to subscribe to the sites newsletter. You could have it so there are multiple newsletters, kind of like this: (View attached image)

Then in the admin, there should be an option where you can e-mail just users subscribed to a list, or multiple lists, whatever. That way you are just e-mailing the users that are subscribed. To unsubscribe they simply change their profile in the CP by unchecking the newsletter subscription.

Anybody else think this is a good idea? I personally pay $20/Month just for a list management, and something like this would save me the money.