Nowadays, many developers buy some traffic for increase app rank. Of course there are many companies which cooperate with users and can provide developers with incentive installs from real users and devices on a CPI basis. It will boost your ranking and make you visibly for organic users. One my friend used for this purpose CPIMobi and i want to know if anyone tried it?
I do not recommend CPIMobi, they don’t deliver and what they deliver is not qualified for you app 95%. I ran 3 campaigns with the baddest experience in that service. Still some dollars (credits) locked with they, no way to deliver or to have the money back. Skype support is mute. One of the many campaigns I trying is to deliver 90 downloads in 10 countries and they did 19 from November 2018 until now. Sad.
Buying traffic won’t be a cure if you do things wrong and that’s why advanced analytic tools exist. Some of them are described in the article and if you are involved in app development and marketing, I am pretty sure that the article will give you some valuable info.