So my game has been in the app store for a week or so now. I've seen something with this game that I haven't seen with my other one - people are actually consistently playing it (based on admob stats). Problem is, it isn't getting downloaded much so my userbase isn't growing. I've shared it on facebook, twitter, posted on forums, et cetera.. I think it's time for aggressive marketing. I've heard that iAd is a poor way to market an app, and that you'll end up paying a lot for only a few downloads. So, if I'm willing to spend money, where is my money best spent? Chartboost?