I remember a satellite channel experimenting with the idea of airing playthroughs of games. They were usually abridged to around 3 hours and did not contain the average playthrough banter you get with most LPs. Personally I enjoyed watching it when I with my dad. I have no idea if they're still around though or what the channel was called.

EDIT: I was trying to find it and found references to the show Cinematech although I'm fairly sure I watched a full playthough of Hitman and most of the cutscenes from Far Cry instead of just trailers over the course of 30min.