As long as recoveries are still possible, scamming will be a thing on the Runescape market. It's Runescape trying to prevent account trading and will likely never remove it.
Same counts for a SDN manager. Maybe for approving free or VIP+ scripts only, but also to check if the scripts in the SDN are still working so it doesn't get loaded with an insane amount of broken scripts. Last week I've send a PM to Alek with a list of scripts which are probably broken. I don't mind testing them because it will keep the SDN clean and clears space for other scripters (like me), but I don't own all the scripts ofcourse.