Because information wants to be free and you can't copy a camera? Surely most people would not just buy an expensive camera from the place it costs most, even though the service might be better? You would probably compare prices and unless you have a strong alternative argument (moral?), you'd go for one of the cheaper places.

I'm not sure we should put the morality in Google's hands. If you want top journalism, you ought to pay for it, but it makes sense search engines provide the quickest path to information, and that's usually not a paywall.