I love movie previews.
Some theaters I go to play commercials (i.e. ads for products) before the movie previews.
I would more than happily sit through a long block of all the commercials before the show if it meant that I could watch the show, in its entirety and without interruption.
I can't find it, but I recall a conversation with Joss Whedon who proclaims the commercial interruption to be the hardest thing in TV-writing to accomodate, and are the most jarring obstacle to an otherwise well-told story.