Why i am getting scammed by buyers

So, long story short,i delivered one yelp review to some buyer here, and agreed to deleiver more if he pays on time. Review stayed in recommended section , but now i am not able to find him online. Why people resort to such acts for as little as 20 or 30 usd. I will be opening a shitlist in a day or two if he didn't respond. I know with pay after work services its not alaways 100 percent sure ,that you get all your payments but why put reputation of your client at risk for whom you are…

Why i am getting scammed by buyers