Thank you for your post! Sorry for a delay in reply I've been on holiday the past week.
I have been thinking more about how to increase revenue from beorg. Currently most of my income is from freelance development work - and beorg revenue at the moment is only equivalent to 1 days freelancing per month. I would love to be able to spend more more time than I do on beorg and really accelerate development. Eventually I want to find a way to make beorg Free Software - however this isn't an easy proposition for an indie developer who needs to generate a decent income from my time spent during the working day. My dream is to get enough users on board who are not necessarily current Emacs and Org mode users - but users who just want a decent task management app for iOS and see the benefits of plain text. At that point making beorg available under a free software/Open Source license could then become a reality as I would have sufficient time to both manage it as an open source project and as a business.
beorg 3 is going to be released next month and will introduce subscription pricing. For users who don't want to subscribe I will continue to offer the ability to unlock individual extensions with a one-off in-app purchase. Alongside this is a new clocking/task timers extensions and I hope that beorg will then become attractive to a whole new group of users who will see the benefits of plain text time tracking.
Asking for contributions for a specific app outside of the App Store can be problematic (although not impossible) as Apple like to make sure they take their cut. So ideally I want to stick with the current in-app purchase model, however may review this in the future.
I think this is sort of related:
Thank You so much for doing Beorg, and being such a good citizen about making it freely available. It's cool seeing it get better over time, too. I just went to leave a tip, and on the way saw information about Premium, and thought "gee, an annual thing is a better way to support this, even if I don't currently have need of any of the extant extensions." I did have rather a lot of trouble figuring out how to sign up for Premium, though. I eventually found it in the forums, but it might be worthwhile making it more front and center somehow so folks who want to support your efforts can more easily do so.
I am going to look at improving how users are told about Premium (including existing users who installed beorg before Premium became available). Thanks for support beorg!