Here is a detailed list of top paying google adsense keywords from financial sector. This is probably the best paying niche along with medical field. The data is obtained directly from google's tools itself. But no claims are made about the accuracy of the data, due to the volatile nature of the adwords keyword bidding.
auto loans
$11.46
1031 tax
$11.37
tax audit
$11.37
health insurance
$11.36
unsecured loans
$11.36
family insurance
$11.35
american mortgage
$11.34
bad credit car loans
$11.33
insurance canada
$11.28
uk mortgage
$11.27
quicken turbo tax
$11.26
temporary insurance
$11.24
credit card processing
$11.23
reduce debt
$11.16
fico credit score
$11.14
paying off debt
$11.11
real estate loan
$11.11
FINANCIAL KEYWORDS 5