App installs still be the crucial factor for ranking position.
You need to get traffic by means of frequent installs of your app. The more installs you have - the higher position your app gain. Being on top let you generate a lot of organic installs and revenue accordingly. 
Mopeak represent new service of iOS installs for paid application!
The service rate is depending on the app’s price. To know detail please connect the manager at Skype: “mopeak.info”