If the Internet has taught us anything, it is that we can give our product away, and still make some money from advertising. You should be able to make some money on the clickable ads that will appear on your application. It will not be enough to live on, so plan for that.
In the lite version of Angry Birds, there is usually a bar that appears in the corner for ads (see Figure 6-5). I will have to admit that I hit it accidentally, but I’ve never bought anything on it. This is a prime example of advertising on an application, and you can bet that the paid version is without those ads.