I've probably got some Demonoid invites you can have for free if you still need one.
Why would anyone waste their time with demonoid? It is not as secure as most would think. They have way too many open registrations throughout the year.
Demonoid is the pirate bay of the invite only world. I would not feel safe using demonoid at all.
Your dreaming if you think a private tracker is any safer as you demonstrate here anyone can buy an invite including the MPAA/RIAA.
Personally I don't use torrents at all as Usenet is safer, faster, and just as convenient. The downside is it costs a marginal amount so people are put off. Doesn't bother me either way 
