1. When an application is using freemium model that will allow many users to use your application.
2. When there is lot of users, you can generate revenue through ads.
3. You can generate more revenue through ads then what you could have got in pro version.... (more)
1. If you have a product idea/application idea, you should see what real world problem is your application going to solve?
2. You should do some research to find whether your application idea already exists or not.
3. If your idea exists, you should find all your competitors.... (more)