Might be best to put some sort of red warning on most of the Marketplace sections, whether it's to look out for ponzis, always use escrow or don't request or give un-collateral-ed loans, but people should have common sense. No amount of warnings will ever stop some people from losing their money.
then I agree with this, since it is shown in certain sections.
unless the moderators wants to move those kind of thread to some specific sections, it's better to show it in most of the marketplace sub-boards