If PaypalforBTC is talking about player collusion in Nitrogen's poker tables then yes, I could see it happening. Even Pokerstars have caught Chinese players colluding and not only that, there are bot rings exploiting the system too. But super users? I'm not too sure about that. If ever someone could prove it, then that would be a disgrace.
Many many times at the higher limits you will see people join 3 at a time and just all happen to disconnect at the same time.
I tell nitrogen CS this and you know what they tell me? "You are able to self exclude yourself from the poker room.."