I have put a lot of work into the Android apps that I've developed. However, with Android, few users want to pay for apps. Many users believe they're entitled to these apps with little regard to efforts put in by the developer.
So to make this worth my efforts, I have put in Airpush notification bar ads into the app as it is more cost-effective for me. All they do is show up in your notification bar *once* per day. You don't even have to click on them - you can clear your notification bar and they're gone.
As the user, you have the ability to do one of the following:
1. Buy the app. It's $3.99 USD.
2. Download the free version of the app, and deal with the ads.
3. Don't download it if you don't want to do 1 or 2
Your support drives the development of this app. Thanks.