[xer0]

Probably the trailer, as we think of it in the movies, is too expensive. Trailers are shown to and amortized across a national audience, and I assume are placed in front of movies where the audience will have a positive response.

That said, I see static local ads in the discount theaters. I suppose a theater owner would show any ad that was paid for, but most movie theaters are chains and probably make large deals for the trailers, just like they do for the movies.

Or something.