Limited lifetime subscription

I think if y'all offered a limited lifetime subscription that it would really help in the development of features which would allow the app to sale itself much quicker, yes it would hurt a little for some yearly subscriptions but I think it would be of great benefit for the long term if the money you make from the lifetime subscription helps introduce more desirable features and help you sale your app very quickly to users, but that's just my opinion and just a suggestion and thank you for a great app and service