Real-time bidding (RTB) is expected to grow rapidly in 2013. As it grows, so will the cost per click. Plus making research even more important. Google now puts a heavy weight on relevancy. Your site must have good content, fresh content and all the relevant to your brand. 2012 was a huge year for real-time bidding. Statistics show that from 2011 to 2012 real-time bidding group by 98%.
I found this article on real-time bidding which has some fascinating statistics and even future predictions. If you would like to read some interesting information in the search marketing world then this webpage is for you.