As far as NBA betting and predictions, you can used this thread: https://bitcointalk.org/index.php?topic=5091185.0

Of course, you can have your own betting thread if you want to build a community by yourself. Nevertheless, I've seen it before and most of the time, they totally forgot it, or at least be active and their thread suddenly die down.

So hopefully you can maintain your own thread, the same enthusiasm when you started, and even if you are in a losing streak, you still need to keep your betting thread alive, just saying.