Direct Traffic - hardly click ads. Reffered Traffic- Some time Search Engine Traffic - A lot compared to both. This will happen only if you have proper ad placement and merged with content. Experiment a lot, create channels. Get statcounter, you can see the exit link activity (from which you can track who clicked ads and where they came from).
google adsense doesn't like it but indeed it is a good trick, but you should try to write about things people would like to have more information, if you write about something people may be googling to buy it, when they read your review they might be still interested and click on the ads to get more information/buy