His suggestions will only bring backlash. It will make scam and scammers hide, because when you disable signature in those boards, people will rarely visit them. So, so many accusations will go unattended to.
Inasmuch as i do not agree with the idea of OP but saying that there will be less engagements in those boards if signature codes are not displayed is not true, there are still sections and threads in the forum that generates enough traffics even though advertising codes are not shown.
Don't just make baseless statement. Can you mention the boards where signatures are not displayed, yet they still generate enough traffic? Just mention the board here and earn 1 merit from me. Have you taken a look at "serious discussion" board? How active is the board and others where signatures don't display?
It will make scam and scammers hide, because when you disable signature in those boards, people will rarely visit them. So, so many accusations will go unattended to.
So you admit that the primary reason is paid posts?

In my opinion, in cases of scam, getting three helpful replies (advice) is better than 100 generic replies.
Yes, I admit. I also agree with you that three helpful replies are okay. But, sometimes conversations there need a very serious follow up. If signature is disabled, a user like Holydarkness will no longer be effective in scam accusation board because he will have to also post in other boards to complete weekly post quota.