From The Economist‘s “The price of online robbery” (24 November 2008):
Bank details are the most popular single item for sale by online fraudsters, according to a new report by Symantec, an internet-security firm. They are also the priciest, perhaps because the average account for which details are offered has a balance of nearly $40,000. Sales of details of credit cards make up some 30% of all goods and services on offer on “underground” servers, and nearly 60% of their value. Cards without security codes (or CVV2 numbers) are harder to exploit, and are usually cheaper.