These are the commercials that companies, banks, and even public utilities play when you are on hold. When this happens, the caller is generally too distracted from the ads to be able to do anything else, such as reading email or engaging in other useful work. I just can't direct my attention to anything else. My efforts so far have not produced any change. I don't believe that.
High visibility is what attracts advertisers.
Furthermore, the networks pay substantial rights fees to broadcast these events. If the NFL wants to help reduce the advertising static, they need to reduce their rights fees accordingly, thereby making it less necessary for the network to sell more and more advertising to justify their investment. In order to show a profit on their investment, the network must find new and innovative ways to attract the advertiser to a given audience. In their world, a blank space isn't selling anything, therefore not generating income, and is wasted air. If it becomes unprofitable to carry an event, the networks will not do it.