Anyone can create or join a BBT-room. When you create a BBT-room, you are required to allocate collateral in $SNK tokens and also pay a fee that is 2.5% of the collateral. (This is to avoid BBT-room privileges being abused. Also, we too need to make a living.) If someone wants to join your BBT-room, she will have to match the collateral and pay the same 2.5% fee. Once you created a BBT-room, you can exit it and be refunded, if after 15 minutes no one joined.