Several other things really are valuable, one thing that surprises people is that Advertising is actually valuable, if nobody knows you made this thing/ service/ whatever then they can't benefit from it. Now obviously there's a big gap between "Have you heard about bicycles? I was dubious at first but it was surprisingly easy to learn how to use it" and the pop-up insisting that maybe you've got Restless Leg Syndrome and should ask your doctor - but fundamentally advertising delivers some value for our society.