My point was that Grindhouse movies have niche fanbases. Sure, they're meant to be accessible and profitable, but only to their hardcore fans who like that sort of style. Spielberg's trademark films (pre-Schindler's List, really) are accessible (or meant to be) to all; they're designed to be rollercoaster rides, fun for all the family (a film about a legless Nazi she-devil is not), and in buying a ticket to see the film it's also designed to make money for the popcorn companies, the multiplexes, as well. They (Spielberg's works) are products of a vertically integrated system, not an independent structure.

I think you'd get a lot out of that Richard Maltby book I linked to, svsg. Visit your local library.