I think people here underestimate the power of the "cosmetic" improvements to movies to attract and grow a consumer base. Natural, since you guys are readers...but still, the opinion remains. People do find powerful sound effects, surround sound, and animation that appears at lest close to "reality" (or not close, e.g. anime) to be reasons to spend their entertainment money.
Reading engages only the mind - not even vision as a sensory input, really. The full range of effects that can engage vision, hearing, touch (or other physical effects) are powerful additions. Taste and smell are not yet added, but smell is pretty much a given; I'm not sure about taste.