That's a simplistic viewpoint. If ads weren't useful at all, no one would click on them, or, if they did, they wouldn't buy whatever was at the other end. Ther

That's a simplistic viewpoint. If ads weren't useful at all, no one would click on them, or, if they did, they wouldn't buy whatever was at the other end. There is such a thing as artificially inflated demand, which can be a problem, but I don't think it's likely that all advertising falls in that bucket.