Re: Why use this stuff?
You shouldn't have put such a clear privacy notice on your door - you probably scared everyone off. If you make it 64 pages long and finish it off "by pressing the doorbell I confirm I have read and understood..." then everyone will ignore it and press your doorbell anyway, so accepting it; you will likely get more visitors, possibly even a love life (ditch the christmas sweater now).
You likely have an indoor cat, and I'm sure the policy states that anyone inside is deemed to have accepted the policy, hence you still have a cat. Cats, like humans, will generally sell their privacy for tuppence anyway, or in this case likely a kitteh treat.