DEAR TINKRBL44,
"We" , or at least I, know it is to "sell" and not entertain, but I keep it on in the background for a few reasons AT TIMES.
If I am cleaning from room to room, I can't really follow a show or get invested in it, but I can catch a product on air at times that I might be interested in for myself or more likely for gift giving, as I purchase my Christmas gifts (and others) all throughout the year. I never know when something might "pop up" so it's a good time to have it on.
I never just sit and watch QVC like its a long TV show. So keeping it on while doing other tasks keeps me informed of prices,etc. and product availability. I often use that information when I shop at B&M stores.
If I want to listen to music, as per your radio comment, I prefer my own extensive collection of music as there is never enough time to enjoy all that I have for it is quite large and selective.
Perhaps that will enlighten you to my specific remarks and maybe why others do the same.
Your comments weren't applicable to mine.
Have a nice day.