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.
Spending 5 or 10 minutes each day to visit spam boards, and report spam posts, as small contribution to clean the forum. Some easy place to find them, altcoin discussions, announcements (altcoins) - especially new born projects usually bumped by newbies. Badge has nothing to do with money, financial aspect, I don't think people with reporter badge will have higher probability to get acceptance from managers. Like what managers look at merit history, that is not enough to assess post quality. Therefore, I dont' think there are many people will abuse report system to get badges.