I would anticipate most users in the future will assume when they buy the app, they will receive basic guide data. Seems necessary for the app to function. In addition, I would anticipate most users are looking to get away from monthly fees from cable providers or other for a DVR solution.
The Plex model might be a great fit here. They initially had an iOS app for $5 and a $5/month plex pass or $75 one-time fee, which continues to offer a ton of functionality that goes well beyond just the app.
I would believe pricing for channels DVR could be done so in the same regard. We all have paid up to $25 already for the live tv app. To gain access to ALL features, a small monthly fee or one time fee would be fit. Although I will say, for $5.00/month their one time amount, plex gives you a ton of features. That said, I might recommend scaling into this as the popularity and traction takes hold for channels or you start to get better feel of what your product is evolving into.
My hope is that this is a great compliment to software such as plex rather than replacing it; and is priced accordingly.