What Are The 20 Most Expensive Keyword Categories In Google AdWords?

Google makes a heck of a lot of money from online advertising. In fact, 97 percent of Google’s revenue, which totaled $33.3 billion in the past twelve months, comes from advertising.
WordStream, a venture capital-backed provider of hosted software that automates most of the manual work involved with creating and optimizing both paid and natural search engine marketing campaigns, has done some research to discover which keyword categories fetch the highest costs per click (CPC) in Google’s AdWords solution.
And of course, they made an infographic based on the results of their research (embedded below).
WordStream compiled data from its own, vast keyword database and the Google Keyword Tool to determine the top 10,000 most expensive English-language keywords over a 90-day period.
Subsequently, the list was organized into categories by theme. The largest keyword categories were then determined by weighting the number of keywords within each category, as well as the estimated monthly search volume and average cost per click for each keyword.
For the record, Google AdWords is an auction-based marketplace where advertisers bid on keywords to compete for top ad placement, with a minimum bid of 5 cents per keyword (update: actually, there’s no longer a minimum bid for CPC campaigns).
The top twenty keyword categories that demanded the highest costs per click are:
1. Insurance (example keyword: “auto insurance price quotes”)
2. Loans (example keyword: “consolidate graduate student loans”)
3. Mortgage (example keyword: “refinanced second mortgages”)
4. Attorney (example keyword: “personal injury attorney”)
5. Credit (example keyword: “home equity line of credit”)
6. Lawyer
7. Donate
8. Degree
9. Hosting
10. Claim
11. Conference Call
12. Trading
13. Software
14. Recovery
15. Transfer
16. Gas/Electricity
17. Classes
18. Rehab
19. Treatment
20. Cord Blood
Unsurprisingly, the list of most expensive keyword categories is clearly a result from people who, en masse, turn to the Web in search for help, whether it’s for financial, educational, professional services or medical aid. WordStream concludes that the keyword categories with the highest volumes and costs represent industries with very high lifetime customer value: in other words, companies that can afford to pay a lot to acquire a new customer because of the nature of their business.

But I would have personally never imagined that ‘insurance’ would be netting Google up to almost $55 per click. Think about that for a minute.