Unsurprisingly, car insurance has a high cost per click rate.

http://searchenginewatch.com/article/2095210/How-Google-Make...

maximum $54.91 per click back in 2011.

Since then, the ranking has been taken over by mesothelioma lawyers.

http://www.spyfu.com/TopList.aspx?listId=3

$370.53 per click.