Check the Investor-based games board: https://bitcointalk.org/index.php?board=207.0
it's full of ponzi schemes and bitcointalk.org is ignoring it.
Their lame explanation is that it would be more work for moderators to keep the whole forum clean, even that argument is a proof that this forum supports such illegal games.
more info: https://bitcointalk.org/index.php?topic=1477454.0