This is a question/suggestion for the TEAM.
Have you thought about implementing a logic of ad display connected to the search terms inserted in the address bar of the browser? To exemplify: if I search for "buy new car" you can use it as trigger event to display an ad of a car manufacturer or of an insurance company.
In so doing the price charged to advertiser could increase significantly as well as the reward paid to the user. This is due to the fact that the ad would fall under the current classification of a search network ad rather than a display network ad, with a value for the advertiser that a few times higher.
Please give it a thought.