I loved my old Ultimate TV DVR -- one of the earliest. It had a true 30 second skip, and I got to bypass commercials entirely.
My current DVR (DirecTV) calls it a 30 second skip, but it's a fast forward, covering the 30 seconds in about 3. Still love it -- I get to thumb my nose at commercials.
However, the On Demand downloads of broadcast TV shows -- it has fewer commercials, but you can't fast forward through them. I don't watch programs on these terms.
I don't typically watch live TV. In fact, when I watch football games, I record them, and I start watching them an hour or so after kickoff. I then zip past the excessive commercials (I hate commercial breaks before & after kickoffs), official review time wasters, and talking heads spouting cliches. I get done about the same time as the game ends, saving myself an hour.
So, no -- if a video has a commercial that I can't bypass or fast forward through, I don't bother.