Reporter badge, if does not have appropriate algorithm, might cause another type of abusement, and shady attacks.
Somehow it could be as @hacker1001101001 just said that someone could make a bot just to make them get many reports and that will be easy for them to get those badges. I report some posts without thinking I could get that badge but a good thing if it will be implemented and I'll accept that fact that I could get a badge, the only thing is not all to have the same thinking as I or some other people neutral to this "reporter badges".
Most people are abuser but if the only reward for a good rate of reporting is just a badge or nothing else involved especially getting some merits or ranking up I guess that will limit some people in regards to the satisfaction they'll get. What I want to point out is just let it alone a badge and increase the quota of the required report to something like 10k or above.