My wife and I are people who keep the TV on more than we should. Allow me to concede that right up front. We watch (as in, actively choose to pay attention—or as close to that as anyone does in this era of Twitter and iPads and the other diversions that can co-exist with TV viewing) a fair number of shows, but there's also times when we put something on that's mostly just background—well, more pseudo-background, as it can prove to be something that gets as much attention as the shows we actively sought (and probably recorded) but without us having the specific intention of devoting ourselves to it in any way. It's something to have on while, say, making dinner, or cleaning up after dinner, or after going to bed as something that won't be disturbing and where it doesn't matter if we fall asleep part way through the episode.
Over the past couple months we've switched over to making HGTV that just-throw-on channel. People buying houses or fixing up houses or designing houses is innocuous enough to not be disturbing, but can still be compelling enough to sometimes make us back up and watch the beginning again if it gets interesting later. And we figure it might help motivate us to get back on the hunt for a property and stop renting.