Surfing from link to link is very much the essential and original behavior of users on the web. A user often has very little idea what's behind the next click. I don't know what I'm getting behind the link, so a "show me the stuff" mentality would yield a deeply uninformed transaction, even if we were to think about every click that way. But from a founding perspective, the idea that every click is a fee-for-service proposition is not a basic tenet of the web or a reasonable assumption to be made of every user.