What you earn will depend on your reputation, the campaign, and the market at a particular time. Quality posters earn more because campaign managers feel that their reputation will give the brand attention. Recently many campaign managers were scrambling for former Chipmixer campaign participants because it is generally believed that they are quality posters. Some campaigns pay higher than others. This might be a result of the company's budget or plan for the campaign. I recently observed that the fall of Chipmixer gave rise to more mixer firms. And some news gambling and exchange companies recently started their campaign. So it seems there is competition between these firms to attract quality posters. This has led some campaign management to increase their pay to make it more competitive.