Informed by whom? Advertisers want viewers, very doubtful any will give up a large audience. Media is corporate owned and operated it loves numbers, and if the numbers come, you can be sure they'll be very happy.
You have all missed the point. Here is the logic. A Hillary commercial comes on and angers the opposition followed by a Trump commercial angering the other side. Now viewers are riled up and now Sears comes on wanting to sell lawn mowers. Given the upset viewers Sears does not want to be associated with either group, so they opt out of a tv ad during the campaign season. Major companies are looking at it this way, not necessarily Sears.