There are exceptions to all of this, however in general, someone who joins the forum for the purpose of conducting business will also otherwise contribute to the community, but only as long as they can continue conducting business. So if something is substantially impeding their ability to conduct business, they will stop contributing otherwise to the community. Also, on its face, having the warning to trade with extreme caution is going to prevent you from trading, and as such, many people will not even attempt to continue trading. This is not the case on this forum, however many other forums ban scammers from trading and some people may have seen elsewhere that those who are "tagged" as scammers cannot continue to trade. For those that attempt to continue trading after having their warning to trade with extreme caution on their profile and marketplace posts, few are able to conduct any meaningful business.