I was just thinking that motivating people to "fight" against the scammers might help.
This is similar to what theymos was planning as regards to reports and badges being used as an incentive to encourage members to report spam posts. But that was put on hold...
Sorry for the wait, when I went to implement this it ended up being quite a bit more of a can of worms than I originally thought because of opting out, preventing certain report-count-padding strategies, etc. It's still on my to-do list, but there are several things above it.
Implementing another badge may not be plausible at this time due to the same reasons and other projects which are yet to be done.