Pay per install is a much easier way to earn money as compared to Pay Per Downloads (Surveys) and monetization.
It requires less effort and the ratio of users successfully completing a software install is far greater than users completing a survey.
Let's do some basic calculation-
These sites pay around 1.5-2$ per every download from US. (Rates are quite low for other countries)
So you have to post content which will give you most downloads from the US.
Assume that you make 10 people from US download your content every day, this gives you 15$ a day and 450$ a month.
And