My personal experience is very similar to what jzdziarski mentioned. Make a good quality app and support it, you will make money on it. Dont invest money on mar

My personal experience is very similar to what jzdziarski mentioned. Make a good quality app and support it, you will make money on it. Dont invest money on marketing, I have heard horror stories about it, unless you are someone like EA, amazon or target. There are a few dirty tricks that I have noticed being constantly used by other developers like releasing an update as soon as your previous update gets approved to be in the new release section. We don't do that because we are serving a niche market and we don't want to upset users, but it works. (IQ Test by McPhun is amongst top 5 apps in education for last 6 months and they come out with an update every week. They do it for almost all their apps.)