They're not always relevant - especially when obscure / slightly older movies are buried. E.g. when searching for 'hobbit trailer video' the original is buried by trailers of the sequels. Similarly, if you search for 'indiana jones and the kingdom of the crystal skull trailer video', the movie itself and various fan / spin-off trailers show up - the first trailer I found was a page into the results. With an IA the relevant trailers (mostly hosted on Youtube anyway) could be shown to end-users instantly without them having to filter through youtube results or explicitly type 'videos'. They could even use the release year to filter the trailers.
posted by TopHattedCoder Community Leader4 years and 2 months ago Link