I reported to nuke the user too.
The user can be nuked if he breaks badly some rules. If you've found him plagiarizing, for example, and you can prove that, he's as good as gone.
But just by asking nicely, you won't obtain anything. Even more, if it's a case of scam, that's not moderated, so your actual choice is to make (in Scam Accusations, see the reporting format there) a new topic proving his scam, to make people tag him. It won't nuke him, but the trust feedback will be visible and people will start avoiding him.
Duplicate topics in two boards.
That's not enough. Duplicated posts are reported and removed. But nothing more.