Ponzis should definitely have its own board, but there is also a problem with that. If it has its own board it encourages more of these and people with their fake sites will be scamming people there with ease. On the other hand it will separate real gambling threads from the ponzi schemes, and while ponzis are gambling sites they work in a different way.
It won't encourage people after they lose their BTC savings. These aren't even a gamble as the operators are the only sure winners. I guarantee if there was a board with only ponzis. It would be dead after two days.