Like others have mentioned, I'm not a fan of the subscription model either. After watching the demo video and reading through your site, I instantly went to download the app in the app store, only to be disappointed in, yet another subscription.
I'd gladly pay for the software and repurchase at major releases (if I wanted to upgrade)! I'm not looking for more subscriptions though. Give it a thought. I'd like to be one of the paying customers :-)