I'm kind of like you, except that I occasionally do buy TV/movies sight-unseen, but only if (a) it's a good sale, and (b) I've still had some prior exposure to whatever it is, even if it's something as simple as an icon post. Again - advertising! All of this internet stuff amounts to advertising.

Most people will still buy things, because there are advantages to actually owning them. (And I think there's a primitive impulse to have physical objects - we want to see it, and hold it.) They're doing themselves no favors with this.