Advertisers pay a lot to air commercials, and the price they pay is based on the projected popularity of the show being interrupted. When a TV network’s ratings are great, it might try to cash in by airing as many top-dollar ads as its viewers can take. But when ratings sag, that network has to contend with both annoyed viewers and shortchanged advertisers. That’s why, according to a new report, after years of cramming ads into every nook and cranny, media giant Viacom (MTV, Comedy Central, Nickelodeon) is going to try shaving a few minutes of ads during prime time. [More]