Need some advice, thanks. I found the world of IM in 2013 and after two years hard work, now I have a good income from SEO, but I have 0 experience in paid traffic. Google changes everyday, so I thought I can't put all eggs in one basket. I must have another income source in paid traffic. I have missed the gold age of web, so last month I started my first campaign on mobile, it's an app download offer. Then an account manager of some network told me(privately):app download is not a good idea in 2015, newbie is hard to earn in app download, you should try some other type of offers. My goal is to reach 500$ profit per day, I have seen many big players reach thousands dollars profit in 2014 by App or Apk, I don't know if I have the chance to reach the goal by App download since the market is changing everyday. I think it's important to follow the trend, newer market means less competition and more chance to be success for newbie, sometime I may think: if I were doing SEO in 2008 not 2013, I would be millioner already. So I'm afraid if app download is outdated before running my first campaign? I also have interesting in pay per call offer or something better(newer) than app, but I don't know which one has the most potential to reach 500$ profits per day. I hope some friends can give me some advices if you have your opinion in mobile internet market.