I find your logic faulty. A significant percentage of users will click a text ad if the only exit links are those text ads, especially if the page the links are on did not meet their needs. Clicking an ad in no way implies that the user is satisfied with the page they're viewing, the ads on that page or the ad serving company when those are the only options available (other than hitting the back button or closing the browser).
If you like analogies...
A customer on a flight must love airline food otherwise they wouldn't eat it. ;-)