The article doesn't explain the discrepancy between the tiny earnings of the hackers and the enormous loss of the banks. Which one of these is it?:
1) The hackers lied and have millions stashed away some place?
2) The middlemen who buy the card data from the hackers and get mules to make fraudulent charges and withdrawals are the ones raking it in?
3) The banks are puffing up their losses in order to get tax deductions or make insurance claims, or maybe just to get the Secret Service interested enough in the case to do an investigation?
The banks can exaggerate their loss in all kinds of ways: including in the loss payments that they were able to later reverse, or including losses that were eaten by the merchants and not the bank, or including the salary of every member of their security and fraud department, etc.