I do not think that disabling the self-moderation feature for topics with financial relationships relates to scam moderation. With the same success, the restriction on the use of avatars of users below the Full Member rank can also be attributed to moderation, although this is not so.
Actually I don't like how scammers get freedom in this forum without moderation as it can give them a chance to scam more other users on the forum. Ratimov, I know what you mean but I doubt the admins will because the scam has been going on for a long time without moderation on this forum. While disabling that feature would be another solution, it would be a disadvantage when a reputable user wants to moderate their thread to prevent spammers. I don't think admin would create any special restrictions in thread moderation based on user reputation, if they did then it would apply to all users.
As I said, reputation and trust rating should make one cautious before making a trade. I just don't think you should be held responsible for the mistakes other users make when they don't realize the scam even though your attitude is a noble one. Users should care that we shouldn't trust anyone online without doing some research.