Hi,
Compared to you price range, i think you should bundle your apps so you dont need to buy for every device which makes it a more complete product. Also when you are missing the guide grid on AppleTV it would be nice to offer your users this on mobile devices for free untill you have implemented it.
With the new HomeKit features coming to iOS and tvOS there must be a way to get the streams out of your home. AppleTV or a ipad could be like a server in this. Another solutions is to have a serverside application like Plex is doing you can install on your mac or NAS, so you dont need to setup a VPN. So you can use channels outside your home