There is already the investor-based games section for games where the main factor is whether or not new "investors" join the game. Block-Chain based "Schemes" ..for profit could simply be moved to the investor-based games section.
https://bitcointalk.org/index.php?board=207.0I prefer to leave things as they are with the exception of moving the most obvious newbie dev scam coins to the investor-based games section. The type of coins with a 50% premine for the newbie dev to continue development should go there.
That section has this prominent thread to warn people of the risk of getting scammed.
ALL LINKS IN THIS SECTION SHOULD BE VIEWED AS SCAM SITES - A WARNING