Smart Pricing” is Google’s way of trying to keep its advertisers happy by lowering the cost of junk traffic. Unfortunately, they do this at your expense. Having poor advertisers on your site, will lead to you users clicking the adverts, then leaving the horrible site they land on almost instantly. When people do this, Google will think you’re sending out junky traffic, when actually it’s the advertiser’s site that is at fault. This will lead to the money you get per click, going down