Guys, it is absolutely logical that a site administrator can look into the database and see anything stored there, including PMs. This is true for any internet forum there is. There is one private thing that an admin cannot do, and that is see the passwords.
But also note that nobody is abusing this system (except maybe on MTF) because nobody cares about other people's privacy. Only an admin can see the PMs, and in Alex' case, Scott read the PM AFTER it was reported by Nekro for being abusive as it really was. Nothing out of the ordinary.