I am not a lawyer, and the comments below should be taken only as a statement of my opinion and not legal advice.
Actually, no such disclaimer was made during the sign up process (yes, I read it). It's probably arguable that marketing for the Thant Trophy doesn't fall under the primary purpose of us providing information to you...and without his consent (i.e., opting out), it's possible that there is a breach of the National Privacy Princples (Privacy Act 1988 (Cth)).
Hell, there isn't even a privacy policy on this website.
That said, the fact that VCENotes.com isn't an 'organisation' in the legal sense (?) could make that void, however. Mind you, it won't reflect on you well as one who is willing to give away other people's private information for your own private interests.
On the note of opt-ing out, be mindful of the Spam Act...it means that you are not allowed to send emails to users formerly of mailing lists who have opted out. Again, this only covers those of a 'commercial' nature (by definition of 'spam').
But, I think it's in your best interests to make it clear what you will use our private information for.
Personally, though, I don't mind receiving information that may be relevant to my interests. It's only one of the many hundred I receive daily about penis enlargement pills or some 'lonely Russian girl' who wants to marry me tomorrow...if I send $3000.