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The following list comes from Search Engine Watch: How Google Makes Its Billions: The 20 Most Expensive AdWords Keyword Categories:
Insurance (e.g., “buy car insurance online,” “auto insurance price quotes”); 24 percent of keywords; top CPC of $54.91
Loans (e.g., “consolidate graduate student loans,” “cheapest homeowner loans”); 12.8 percent of keywords; top CPC of $44.28
Mortgage (e.g., “refinanced second mortgages,” “remortgage with bad credit”), 9 percent; $47.12
Attorney (e.g., “personal injury attorney,” “dui defense attorney”); 3.6 percent; $47.07
Credit (e.g., “home equity line of credit” and “bad credit home buyer”); 3.2 percent, $36.06
Lawyer (e.g., “personal injury lawyer,” “criminal defense lawyer); 3 percent; $42.51
Degree (e.g., “criminal justice degrees online,” “psychology bachelors degree online”); 2.2 percent; $40.61
Hosting (e.g., “hosting ms exchange,” “managed web hosting solution”); 2.2 percent; $31.91
Claim (e.g., “personal injury claim,” “accident claims no win no fee”); 1.4 percent; $45.51
Conference Call (e.g., “best conference call service,” “conference calls toll free”); 0.9 percent; $42.05
Trading (e.g., “cheap online trading,” “stock trades online”); 0.8 percent; $33.19
Software (e.g., “crm software programs,” “help desk software cheap”); 0.8 percent; $35.29
Recovery (e.g., “raid server data recovery,” “hard drive recovery laptop”); 0.7 percent; $42.03
Transfer (e.g., “zero apr balance transfer,” “credit card balance transfer zero interest”); 0.6 percent; $29.86
Gas/Electricity (e.g., “business electricity price comparison,” “switch gas and electricity suppliers”); 0.6 percent; $54.62
Classes (e.g., “criminal justice online classes,” “online classes business administration”); 0.5 percent; $35.04
Rehab (e.g., “alcohol rehab centers,” “crack rehab centers”); 0.5 percent; $33.59
Treatment (e.g., “mesothelioma treatment options,” “drug treatment centers”); 0.4 percent; $37.18
Cord Blood (e.g., “cordblood bank,” “store umbilical cord blood”); 0.4 percent; $27.80