I think you do not have to worry about it
I don't like your idea. In my opinion you report rule breakers because you want to help the community, you shouldn't be rewarded. This also would increase the name of false reports a lot, and Staff would have more work, only because players would like to get the reward or the rank.
If you want in-game rewards just play and if you want a rank you can buy it. :)
I said thread lock, don't continueYou report people because YOU want to make the server a better place for everyone, and not just to do it for a reward.
From my perspective, this is pointless. This may encourage people to make heaps of rushed reports which expect to be denied, due to their being no time in the reports, leading to mistakes, etc.