The chances are that when you imagine a network threat, one thing you think of is a youngster with too much time and testosterone, trying to prove himself. In reality, he is the least of your worries. Don't demonise teenagers, and keep mischief-makers in proportion. They are malicious, but largely inept.
Classic hackers look on the kiddies with contempt.
Real hackers operate for intellectual pleasure, and tend to focus away from Windows, making hacks that give them more kudos. Beyond them there are serious criminals with specific goals. They want to subvert Web sites or get specific intelligence. They use the tricks of the others, but are just as likely to use the traditional methods of industrial espionage, such as bribery and paid informers. All this is clear enough from today's security landscape.