It doesn't take 20 years to evaluate an argument. If, on a case by case basis, there's an argument to be made that any of the proposed answers would be better than delaying a decision, then that's an argument too, with premises and reasoning that need to be evaluated.
>Right. You have an a priori opinion that you don't need a juicer (or whatever), and you stick with that instead of wasting time considering the commercial's many valid arguments about how buying a juicer will totally enhance your life.
Maybe I've phrased it wrongly, then. If I'm watching an infomercial, I'm evaluating its arguments. I don't seek out infomercials, because I'm not interested in a juicer. It usually doesn't take very long for infomercials about juicers to make a dubious health claim when I do catch them, though, so in the past I've rejected purchasing one on the merits.
edit: added "usually", in that I've watched infomercials that never made a dubious claim, and I've used products that have been featured in infomercials and been entirely satisfied.