Thats kinda silly
If you are like most forums then I would imagine you have members who become very good friends. You also hold your own private tournaments if I'm not mistaken. What is to stop your members from getting on AIM and sharing info during your forums games? At some point, especially with something like this which is designed to be fun, you just have to trust that people are honest.
How can you trust your members in private TP games but not in something like this? It isn't like we are talking about alot of money here...
I certainly am... I'm not one to focus on the negative