Most Expensive Adsense Keywords

The 20 most expensive keywords categories with the highest search volume (i.e. the most used keywords) and highest costs per click, thereby netting Google the most money, are:

1. Insurance
 (example keywords in this category include "buy car insurance online" and "auto insurance price quotes")

1. Loans
 (example keywords include "consolidate graduate student loans" and "cheapest homeowner loans")

1. Mortgage
 (example keywords include “refinanced second mortgages” and “remortgage with bad credit”)

1. Attorney
 (example keywords include “personal injury attorney” and “dui defense attorney”)

1. Credit
 (example keywords include “home equity line of credit” and “bad credit home buyer”)

1. Lawyer
 ("personal  injury lawyer," "criminal defense lawyer)

1. Donate
 ("car donation centers," "donating a used car")

1. Degree
 ("criminal justice degrees online," "psychology bachelors degree online")

1. Hosting
 ("hosting ms exchange," "managed web hosting solution")

1. Claim
 ("personal injury claim," "accident claims no win no fee")

1. Conference Call
 ("best conference call service," "conference calls toll free")

1. Trading
 ("cheap online trading," "stock trades online")

1. Software
 ("crm software programs," "help desk software cheap")

1. Recovery
 ("raid server data recovery," "hard drive recovery laptop")

1. Transfer
 ("zero apr balance transfer," "credit card balance transfer zero interest")

1. Gas/Electricity
 ("business electricity price comparison," "switch gas and electricity suppliers")

1. Classes
 ("criminal justice online classes," "online classes business administration")

1. Rehab
 ("alcohol rehab centers," "crack rehab centers")

1. Treatment
 ("mesothelioma treatment options," "drug treatment centers")

1. Cord Blood
 ("cordblood bank," "store umbilical cord blood")

We found that that 97% of Google's revenue comes from advertising on Google sites. In the last four quarters alone (Q3 2010-Q2 2011), Google brought in $32.2 billion in total advertising revenue.