if people will do spam then how a new site will exists if u show finger to spammers they will swallow the whole shoulder, take the example of ciao it was giving payment genuinely but when people do spam it spot paying to Asian people even they block the IP of All Asian Countries but people are writing reviews in ciao through proxy server and they r thinking that they will get paid but they won't.so now a days most of people want to earn money by doing spamming.