It's what media people call those valleys where they run all the TV spots during prime time.
They've been getting bigger and providing everyone with a new reason why TV commercials are less effective these days. (Not to mention providing media buyers with a reason why you shouldn't have to pay as much for one.)
But as I TiVo'd through my nightly dose of television, it dawned on me that network promos and movie trailers must make up at least 50% of the pod content. So that commercials for everything from Miller Lite to Extra Strength Tylenol are competing against teasers for the next episode of Lost or a trailer for the latest Owen Wilson movie. (Most movies these days feature Owen Wilson, it seems. Don't they?) And it further dawned on me that for most people, the Lost teasers and Owen Wilson movies are far more interesting and relevant than 99% of the product advertising out there.
Which is yet another reason people are tuning them out.