Most hackers break into systems for fun.
Convicted cyber criminal Justin Tanner Petersen did it for profit. Petersen is a reformed hacker and former FBI informant who went on a digital crime spree in the early 1990s. Petersen, who served time for the crime and since has gone legit, is more than happy to share the details. I connected it to a laptop that logged the data. Petersen broke into a Sprintnet office and attached the device to a specific network node.