AdSense is an easy program to grasp: it's a great form of an advertising bringing a lot of benefits to every person in the chain. And of course, seeing the results it can have on a business (and a publisher) people encourage this form of publicity.
For the browsing audience this is probably the most straightforward model available, because they can be directed to a lot of new sites they wouldn't have otherwise found. Needless to say, if you have an AdSense banner on your site, and a large number of visitors you'll know it offers a great financial benefit.
But why does it work for the people clicking the links, as opposed to a standard approach?
It is aided by today's society. With bloggers and information based articles on the internet, people may be encouraged to complete purchases, which adsense can provide links to relevant suppliers whilst also benefiting the publisher.
And the good thing about this is that it works for site visitors as well. In fact Google realized that by pleasing the people who are looking for something, and directing them to what they need faster, everybody wins.
It is because of this that a lot of websites promote through AdSense in both content and search. They do it because they ultimately learned that it works for everyone.
If we look in the past, we can realize that this kind of publicity has a great impact over the people, especially in the last few years. When we enter on a web site and we see a graphical banner, our first idea is to cancel it out of our mind, because it's of no concern to us.
That's why traditional banner advertising is wrong. It's precisely because people are becoming savvy that they don’t look at a flashy banner because they think they'll be losing their time with it.
We've gotten accustomed to banners that don't interest us. And we're accustomed to them having nice graphics. So we naturally associate the two things and think that a banner with nice graphics has nothing to tell us.
But we might look at a text-ad because we've grown accustomed to them being targeted at what we're looking for. Basically these advertisements have marketed themselves into being looked at by any visitor.