What about a time delay and X number posts before using the Buy and Sell? Other large forums started doing as they've become popular. It removes the scammers since they're usually in for a quick buck and seldom have much follow through, and usually in that time people who are going to become active in the forum start to contribute, while those that weren't going to contribute leave. Usually in that time they also learn the forum rules, since every forum is has its own unique social rules, and even is unique in how it operates. Since a forum is more at risk from sh*tty members poisoning the environment than having low numbers of new members, it should help moderate between quantity of new members and quality of new members.
A month delay and 5-10 posts is usually the standard, but 3 months is used when they've had issues with scammers.
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