I mean, I like watching Netflix discs and all, but sometimes I would rent movies I'd already seen just to listen to the commentary track. I don't think I've seen a rental disc with a commentary on it for a year or two, now, though, aside perhaps from smaller indie films. It's a shame as they've often not only been insightful as to the specifics of the making of the actual film, but also often given some new light to my overall knowledge of filmmaking in the best cases.
It's a shame, largely because I'm not much of a movie-buyer nowadays and thus rarely get to listen to commentary tracks at all. I would love to hear the track for something like Silent House, but, alas, that appears unlikely to happen.