As we all know, numbers of people, especially in the young generations, are getting their information from the internet these days.
I learned last year the most of the men and women in twenties are taking dairy news information from internet sites. Actually, I do so as well.
However, I noticed that even when I am working on my computer, I still left the TV on. I asked few others and it turned out that they were the same too.
Therefore, in a situation like that, even when our eyes are looking at the computer screen, the TV still broadcasts audio to our ears. I think you already noticed, but that's exactly what radio does.
We generally understand that the merit of the TV ad is that one can show transferring images. As a matter of nature, advertisers try to show their appeal visually. But what if the audience is looking somewhere else and misses the image? It's like fishing with strong line and rod but with no bait or even a hook.
I think the modern TV ads need to have more catchiness on audio side.