The Top 10 Most Expensive Keywords are:1-Insurance, 2-Loans, 3-Mortgage, 4-Attorney,5-Credit,6-Lawyer,7-Donate, 8-Degree, 9-Hosting,10-Claim. You’ll notice that these top ten most expensive AdWords keywords deal primarily with financing and industries that manage vast sums of money. The fact that the educational keyword “degree” is one of the top ten most expensive Google keywords, right up with lawyers and credit, reminds us of the growing cost of education.