SeriousMD Doctors is a subscription because we have to manage, secure, backup and store your data. We also consistently hunt for bugs and improve existing features. There are also various services that also need maintenance work, like automatic reminders, the email notification service, reports generation and more.
The new features that come out are just icing on the cake.
Have you used a photo service or a service to keep your files? It's similar to that but we take it a notch higher as we store different data that syncs in real time. We don't ask you if you want to "overwrite" because our syncing technology is unique and smarter than anything out there.