Usually I have a friend help me send the payments and breeze through them fairly quick, the very first message I got I personally spent a decent amount of time looking into and noticed the guy appears to have been scamming me since January and attempted to again this month.
I will be spending time looking into each case, any foul-play will result in negative trust being left on your account. The per post offer has always been more than fair, I don't see why some people still try to scam/game the system.
How exactly are they scamming you? Padding the amount of posts they've made? Not deducting spam? Upright lying about the amount?
Should be fairly easy ( however time-consuming ) to detect such fraud.