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Hi, you have a vision based on personal experience but is leaving the reality of the marketing objective in all its context.
From the point of view of income in "advertising", clicking on a banner is something complex, although it seems easy, which in theory it is, but not in practice...
... when one of the largest companies or sites began to selling advertising on the Internet they paid and I think it still pays $ 0.001 for each click, you needed 1000 clicks to earn $ 1 on your website, the owner of the site wins for those clicks but the owner of the campaign wins for having a space on your site.
In the case of the ads owner banner has something called "impressions" and if you look at the statistics of Any site, as a general rule if you have 100,000 impressions could have 1000 clicks, this "relationship" is quite "complex" and is subject to things such as the content of the site or blog, region, specific days, events, etc.
But the campaign has gained 100,000 views or impressions, if you have never had the opportunity to see these statistics you can do it with (e.g.) Twitter, you can go to Tweet Analytics.
So the point is,there are many appreciations to think only of the click on the signature.
In fact, In conversations in the offline world I have sometimes recommended some servicies of the firms that are promoted here, the proven scientific effect that advertising leaves on the psyche of people due to the unconscious effect of impressions, whether visual, auditory.