having a charge for it by user is an option but not an option we like
From their web site
Why Brand?
Some forum owners do not want to have their users pay for the full version of the app. This is understandable and we want to offer an option for these forum owners. You have the option of licensing Forum Runner to be listed as a branded app in the app store. That means that your forum will have its own FREE app with your own icon and splash screen that will bring your users directly into the forum. Your users simply will search for your forum in the iTunes app store or Google Market, download the free app, and be able to immediately access your forum directly through your own native application.
For listing in the Apple App Store, you will be required to sign up for your own developer account which will cost 99$ a year. However, we will still maintain the app for you during your license period. For the Google Market, we will take care of listing the app under our own account.