its really hard to get downloads, and with a shitty game its even harder. I got the experience that i want with publishing in google play which is a good thing. Some people say that I need a boost in installs, so an admob campaign can certainly help. i think posting on forums is not enough, atleast for the kind of game that i have. so maybe a more appealing game would fare better but i think the larger publishers use admob to boost their install up to a certain point that it can be sustainable. now my goal is to make a game that will fit that criteria. maybe im wrong but thats what im seeing right now.