When I'm sitting at a computer, I, it or both are doing something. When I'm not using the machine it doesn't matter one jot to me what the background wallpaper or the screensaver are showing as I'm not sitting watching it.
My whole career depends on good packaging. In fact, my whole career is little more than good packaging and the creation thereof but, when I'm meeting clients in my "fancy suit and tie" all the computers they see are busy working away at some project or other. Not a screen saver or fancy wallpaper to be seen!